survivalshop

18" will usually have a Mid length or Rifle length Gas system , I have Rifle length on all three of my 308AR builds , 16",18" & 20" . Plenty of gas power with the Rifle length system with the 308 cartridge , makes a little softer shooter . You can use the Mid lengths system & an adj. Gas Block , they are popular with a lot of people . I don't use them , I like a lot of Gas & there are many ways to reduce recoil impulse with out reducing Gas signature , which you could have issues with different types of ammo if set up for one brand or type . With different Gas systems , the Hand Guard length will determine if you want to cover the Gas Block , if thats what you want . A 12" HG will completely cover the Gas Block of a Mid Length , but with a rifle length Gas system , the Gas Block will be out in front of it & would need a 13.5" HG length to cover it , Your choice .

This is a little off base , but he does make some good points . http://www.infowars.com/paul-craig-roberts-orlando-shooting/

If you don't have your Upper Receiver already , I would recommend the Upper & Lower receiver from the same manufacturer , so if you are just purchasing the Lower Receiver , think about the same Manufacturer for your Upper Receiver in the future .

And another one

Thats Great one !

Your not off base , its apparent something is not right with the DD_Raptor's set up , we have seen Barrel Manufacturers or Firearms companies that have the Barrels spec'ed to AR 10 Spec's , for instance , Fulton Armory's early Kreiger Criterion Barrels , of which I have two with rifle length Gas systems , that use the std AR 15 Rifle length Gas Tubes , that's not the case any more , they are using Criterion Barrels now, but require an AR 10 , Rifle length Gas Tube & some how failed to mention the change when they did it . We had several here that had to change to the AR 10 rifle length size ( they offer a longer Gas Tube now & say on their sight its needed ) to rectify the same issue DD_Raptor is experiencing now , but his seems to be something else , which has not been pin pointed as of yet .

I purchased a complete DPMS LR 308 Lower Receiver assembly , no Upper assembly & it doesn't have a "K" in the serial number , but unknown if it was part of a complete rifle , so you never know . Where are the Components that were removed from this rifle ? What type of Gas Block was on the Barrel to begin with. The pockets drilled for the Gas Block do not look factory made , if they are off , the gas Block can never be aligned properly, a Clamp on type will remedy the issue . Some Barrels have the Gas Block stop flange on the Barrel , set to be able to use A2 Hand Guards & will have the Gas Block set away from it for the front HG cap , a small gap , I will have to measure the thickness of the Cap to show the measurement , but in most after market Barrels are made so the Gas Block seats right against the Barrels stop Flange for the Gas Block. It may not be much , but can throttle the Gas port enough to cause issues . I would still look further into the Barrel Nut , just to make sure the Barrels Extension Flange is seated correctly & the alignment Pin is seated into it grove in the Upper Receiver. Your issue is one of a couple of things , -Barrel has a Gas Block area or gas Port incorrect . if its a true unmolested DPMS LR 308 , Carbine Gas system ,Barrel , this is kinda doubtful , regardless of Gas Block change . - Hand Guard assembly incorrectly assembled ( Barrel Nut assembly ) . It has to be removed to inspect. - DPMS did some strange stuff some times & this may require proprietary components .

I think he was pointing out that any manufacturer will void a warranty if product is molested . AR 15 & LR 308 use the same Gas Tubes , but Armalite AR 10 & Armalite 5.56 use different ones , the only Tube length used in any Armalite rifle that is the same as an AR 15 is the Carbine used in both AR 15 & Armalite Carbine in 5.56 rifles, is the point of the list & is shown for comparison , so yes , its why I said there is something not right in with the posters Gas Tube length or Barrel. The list should read DPMS LR308/AR15 for clarification. What I copied & pasted read that way , but some how got left out , I'm sure it was me , that did something to screw it up . We have seen here over the years , some Barrel makers even have their own Proprietary Gas Tube lengths on their rifle builds .

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Always used Barrel Blocks in a Vice to remove & install any Muzzle Device . Most if not all Barrel Extensions are Left hand threads , some are not . The Barrels Extension should be Torqued to the Barrel @ 150-200 ft.lb's. You will need a special Wrench for installing one & if your lucky ( doubtful ) the Extension Pin & Gas Port on the Barrel will line up correctly . Contact who you purchased the barrel from for repair or replacement . If they won't help you , contact ADCO http://www.adcofirearms.com

I agree , I won't touch one ! A couple years ago I sent a Remington 870 ( new ) Trigger pak to a well known Trigger guy ( because I had never done one ) & it lasted about three years ( Only used for Gun Season ) before the Hammer sear folded over & the Slug gun when off while I was on a Deer Drive . The AR Trigger is as bad or worse then Remington's .

Whats your point ?

BULLET BASICS JUNE 10, 2016 MIDSOUTH SHOOTERS 3 COMMENTS This is a specially-adapted excerpt from the forthcoming book, “Top Grade Ammo,” by author Glen Zediker, owner of Zediker Publishing. Click here to order from Midsouth. by Glen Zediker A cartridge is a system, a sum of its parts. There’s not really any one part that matters most, but the bullet matters much. The material below will offer an outline to identify influential aspects of bullet engineering and execution. There are bullets engineered to perform variously on target, including the proximity of impacts on target. I say it that way because a “match” bullet’s job is to perforate a piece of paper. A bullet designed for varmint hunting, on the other hand, is designed to produce explosive impact, and one for larger-game hunting strives to strike a balance between expansion and penetration. All bullets have to meet their target to be effective, and different premiums often also result in a few trade-offs. Specialty hunting projectiles, for instance, don’t usually out-and-out group as well as those engineered for target shooting. Here are the parts of a bullet. Each element is influential not only in downrange performance, but also in how tolerant or flexible the bullet will be in different rifle chamber and cartridge architectures. Here’s a good example of the differences in bullets. These are both 75 grains. The one on the left is engineered to be fired from a magazine-length round; the other is engineered to provide better performance over long distance, and it should not be fired at magazine-length. Look at the ogives closely and see the curve difference. This gives an idea of bearing area. The point that contacts the lands is the first point of “major diameter,” and from there back down the body is what will be in contact with the barrel. Longer area means more tolerant behavior, but lower potential velocity. Secant, left; tangent, right. Tangent ogives are more tolerant of jump, but not quite as slick on down the pike. How well a bullet performs when fired from a box magazine depends a lot on its shape. For best success, stick with a tangent profile that’s no more than 8-caliber ogive. It gets radical with .224 caliber, more so than any other the author knows about. Left is a Hornady 35-grain V-Max; right is a JLK 90-grain VLD. The latter has a 20-caliber ogive. It needs to be on the lands to shoot, the author says. However, no matter how a bullet is constructed inside, essential elements of any bullet design are universal. I’m talking about the outside of a bullet. Here are the parts: base (that’s the bottom); boat-tail, or not (flat-base); shank, portion of full-caliber diameter; ogive, the sloping “nosecone”; tip, either open or closed (open it’s called the “meplat”). The shape of the ogive and the first point of “major diameter” are very influential elements. The first point of major diameter can vary a from barrel brand to barrel brand because it’s the point on the bullet that coincides with land diameter in the barrel. It’s the first point that will actually contact the barrel as the bullet moves forward. This right here can be a very important thing to determine. When there’s a cartridge sitting in the rifle chamber, the distance to the lands that the bullet has to “jump” to engage is, well, called “jump.” It’s the gap between dead air and first contact. I pick back up on this next article. The first point of major diameter and the shank combine to determine the “bearing area.” This is how much of the bullet is riding the barrel surfaces. The two essential forms a bullet can take are “secant” and “tangent.” This refers to the profile of the ogive. A tangent is a more rounded, gradual flow toward the tip, while a secant is a more radical step-in, more like a spike. Ogives are measured in “calibers.” That’s pretty simple: an 8-caliber ogive describes an arc that’s 8 times caliber diameter; a 12-caliber is based on a circle that’s 12 times the caliber. The 8 will be a smaller circle than the 12, so, an 8-caliber ogive is more “blunt” or rounded. (So I don’t get comments from engineers, there’s more to it than this, as it applies on blueprints to different profiles; it’s the ratio of its radius to the diameter of the cylinder. But my description is accurate as an overview.) Now, here’s how and why all that matters to bullet selection: Generally, bullets with longer bearing areas are more tolerant of jump and tend to shoot better than those with shorter bearing areas. Shorter bearing areas, though, can allow for higher velocities (less drag in the bore). Bullets with lower-caliber ogives are likewise more tolerant of jump and shoot better. However, higher-caliber ogives fly better, that is, farther. This is an important component in “low-drag” bullet designs. Same thing comparing tangent and secant profiles: the first is easier, the second beats the air better. When you see terms like “magazine bullet” or “length-tolerant bullet,” that is referring to those with tangent profiles and lower-caliber ogives. They are designed to endure jump so, therefore, can be seated to “magazine length” without much, if any, accuracy loss. If you want to experiment with the longer, “low-drag” or “high-BC” style bullets, you will find they don’t want to group as expected until they get very close to or right on the lands when the round is chambered. This is the tip of the iceberg. More soon… Related

I hope this sticks . http://www.cbsnews.com/news/jesse-ventura-award-in-american-sniper-chris-kyle-case-vacated/

Proper orientation of Gas Tube , as 392Heminut said , yours is short & will cause issues . These are actual lengths of Gas Tubes, you need to remove the Gas Tube & compare & get the proper size . Looks like something is not right about the size differences, Looks like you only need about a 3/8" or so , need to take measurements. I would check to make sure your Barrel is seated all the way , Barrel Extension Flange seated up against the Upper Receiver . Looks like its an Areo Gas Block . DPMS Gas Tube/AR 15/16 Pistol 6-5/8 Carbine 9-3/4 Mid-Length 11-3/4 Rifle 15-1/4 Armalite lengths, Rifle ( 308 ) ----- 15.5 " Carbine ( 308 )--12 1/16" super SASS Carbine ( 308 )--11" Super SASS< Rife (308 ) ? Mid ,( 223 )------------------ 11 3/4" Carbine ( 223) --------------- 9 3/4 " Rifle ( 223 ) ------------------- 15 3/16" National Match--------------- ?

The Head Commie & his Minions are blaming guns, only Trump is hitting the nail on its head as far as the real problem . I saw an article on Yahoo this morning from some Hockey puck pusher from Canada , saying its not a Terrorist problem , its a Gun problem , what an A$$HOLE , a complete idiot. Its amazing how they use such a fresh tragedy for there misguided political views . The poor people who are deceased are still in the building & they are blaming a tool & not the POS that used it illegally . If he used a Bomb , would they say we need more Bomb control ? If he used a Molotov cocktail's to start the place ( which only had one entrance/exit ) on fire , would they ask for a ban on Gasoline ? How about using a truck to plow down people in a parade , would they ask for a Ban on Chevy Trucks ? ( i couldn't say Ford , because I own one & they aren't owned /controlled by the Gov. ) sorry all you GM owners These Gun Banner's have no Logic , they act on pure emotion & disinformation .

Factory DPMS LR 308 , will probably have the correct Bolt Stop ,if it truly is a new Factory Rifle , as said and not molested , you never know . The Troy Rails I have had , just clamp on the Troy type Barrel Nut or have screws that bolt HG to the Barrel Nut . Should be easy enough to undo the Bolts or screws & slide the HG off the Barrel Nut , as said instructions are easy enough to get from the Troy web sight . From what I have been reading on this thread , I would see if the Gas Block was changed & is miss aligned also . I doubt its over gassed , but under gassed is possible . Do you know if its a DPMS Barrel ? Did the Rifle come Boxed in a DPMS box ? What I'm getting at is, we have seen some Barrel Manufacturers that haven't a clue on Gas Port sizes for a 308 AR & if this barrel has been changed or if its someones build , there could be issues. Another thing you can check , when hand cycling the BCG with out a magazine , on the recoil cycle ( pulling it back ) , do you feel it slow down or feel resistance, after the Hammer has already been cocked ? Some times the Hammer can contact the Disconnector in the Trigger assembly , you will see a mark on the top, front area of the Disconnector . Is the Receiver Extension ( Buffer tube ) correctly Threaded in to the Lower Receiver & the Buffer Retaining Pin set correctly ? Early DPMS rifles had some rough & tight chambers & Polishing them with Flitz Metal Polish & a Bore mop on a Battery operated drill will help . The rough or tight Chamber can slow down the Extraction of the fired case enough to issues with Timing . Just need more info , you have to do some detective work , to get the proper answers . I know your having fun now !

I bought a DJI 3 std drone today , it was quite a bit of brain storming to get it on line & I dicked with it for hours to get it to take off , had a no signal from the RC ( remote controller ) & couldn't get it to link with the Drone after downloading new software , finally after reading some online forums by the manufacturer , I read that after downloading the new software ,you had to re link the RC to the Drone . Well, I must have tried to make it fly a couple doz. times & no deal , until I re linked it & it showed it was ready to fly . It was set on auto how er @ four feet & I thought I was safe in the house , I have halted ceilings , well I started it up in auto hover @ 4 '& that MF took off straight up , all the packing material on the coffee table blew ever where & the drone went straight up & a little off to the right & slammed into my overhead Ceiling fan & then things got real crazy , it chewed up some of the ceiling fans blades up & fake wood was flying every where along with the packing material & everything else that was on the Coffee table , the Drone , after hitting the fan flipped over & went straight down missed me & bounced off one of my Leather chairs & landed upside down at WOT & I couldn't get it to shut off in all the confusion . Finally shut the Drone off , looked around the living room , it looked like a bomb went off with stuff still floating down from above & the Wife comes out with that look , I'm sure all you married guys know & I just started laughing & still get a giggle out of it thinking of it . The drone was fine , just some skid marks from the fan blades , the Ceiling Fan blades has some chunks out of them & can be replaced . I then took my Drone outside & it was fine & got used to flying it , what a blast it is to fly , has a stabilized Gimbal mounted Camera , avoidance sensors , auto return to home & a bunch of other crap I don't know how to use yet , but I have that on the on board Chip in the Camera & can't wait to upload it to see that crash , sturdy MF , I can say that & I will soon be ready for some live recon , because I can not only record it ,but watch in realtime while its happening .

Because this administration has let the ISIS grow to what they are today and ignore them & not taken care of them when called a JV Team which it wasn't. The blood & death of these people are on this administrations hands , period ! When my Daughter was in College , her & her friends used to go to that Club sometimes, its not all Gay's ,they inter mingle there , its a popular place . If it wasn't for this administration letting ISIS get its message out for so many years , this would not have happened , not to mention a host of other attacks in this Country . Now they are brining over a hundred Syrians a day , we can mathematically figure there will be many ISIS sympathizes among them & only a matter of time before they do the same or something worse , but the a$$hole in the WH will stay his course & not rethink his course ,because of his political beliefs . TRAITOR ! This POS had a brief fire fight with an off duty LEO at the door , the only way in or out , by the way , & proceeded to just open up on the unarmed people inside . There has been more mass shootings / Terrorist while O'Butthead has been in office , that's a legacy he will never live down. This POS was working as a security guard with licensing to use firearms & a high level security clearance , so the Commie's will have a hard time saying the same old $hit . I know they will try ,but its not going to be easy.

Nice . Interesting Rail with the gaps in the Picatinny rail for cooling & losing a couple gram's in weight .

My 20" HB by Kreiger/Criterion will shoot almost one hole groups @ 100 yards & doesn't open up too much @ 200 yards , if I do my part with my Hand Loads & its heavy .The 16" next to it will shoot almost as good & I now have a 18" which I'm still evaluating , since I was having FTF issues with a New Bolt , which was remedied with a new DPMS Extractor . Its looking very promising . 18"

Should work fine with Carbine , Mid & Rifle length Gas systems , the Gas signal with any of these systems is regulated with the Gas port size in the Barrel . All of these gas systems can be turned with various methods , be it a heavy Buffer , spring , lighter components or Gas port size , if need be .

For the 5.56 rifles with 16" bbl's. , I have found the Mid length Gas system with a H2 Buffer in a Carbine stocked rifle the most efficient shooting system . Much less pronounced recoil then a Carbine Gas system . As far as what service life of reciprocating components , the more violent the recoil , there is a chance of increased wear.