survivalshop

DPMS 308AR Extractors have a two spring arrangement as you described with the smaller diameter on inside the larger one & as was said above, that O-ring could cause feeding & extraction issues . If its too tight , the base of the Cartridge can be prevented from entering the recessed Bolt Face . If the Cartridge makes it into the Chamber & is fired , the Extractor may hold onto the spent Case too long & it will sit in the action to prevent the next round from the Mag. from being fed ( FTF )

Get a set of Barrel vice Blocks or make your own , to clamp the Barrel into & tighten & loosen the Muzzle Device till its where you want it . The Crush washer will only compress, so far or you can order a set of shim's , to index your Muzzle device & use some rock set or Loctite to attach it . Barrel clamping is the safest way to install or remove Muzzle devices .

Them's were the day's !

Thats not such a bad deal if you want a test target of the barrel your getting , could be a good thing , if it fails their test , they fix or build you another Barrel . Someone has to mount the barrel & test it , its for labor . They make some accurate Rifles , can't argue with that & you pay for it .( & the Name )

That's what I thought also .

The more I watch the video from inside of that truck , the more piss'ed I get . This was a hit squad , a Law Enforcement hit squad that is going to change a lot of peoples minds in how law enforcement is to be viewed in the future . I know that most LEO's are not like this, special hit squad created by our Gov. to assassinate people who protest against them . It doesn't matter if it was the wrong issue or the wrong place to protest , this is going beyond any of that . There should be criminal charges against several LEO's ( if that is truly what they are ) because the rights of the people in that truck were violated in many ways , not to mention Mr. Finicum's ultimate right to life . I was always told or read that if you think the people pulling you over are not what they seem ( this is also spread by LE ) that you go to the nearest PD or a place that you feel safe enough to pull over , these people never got that chance to & even told the ones that pulled them over to follow them to the Sheriff's office , well they had orders to stop them & use extreme measures to do so , even if it was against the law & their Constitutional rights . This is the stuff that starts Revolution's & something we need to nip at the bud , because thats a place we don't want to go as a Nation . For them to say its a good shoot , is a slap in the face of all LE & those of you in that field need to understand how bad this makes all LE look . The fact that Oregon has a unit that did this & the FBI was in with it or failed to control the situation , which they was supposedly under their control . The FBI agents who neglected to say they fired their weapon & how many shots were fired , show the cover up & this should also be investigated , but when the Police , Police them selfs , what is the expected outcome , you know the answer to that !

Whats an ELF push button safety ? Photo's

I have an Early CMMG Lower Receiver that will not function with the Pmag , will work with any steel mag & the Lancer mag, but not any Pmag . The Upper Receiver works ( SI Defense gen. II ) works with Pmags on my two DPMS Lowers , so there has to be tolerance stacking with the CMMG , because it has the same type of FTF as yours . Not every round , but it will have issues with every mag. Saying that , check your PMag as to what Generation it is , because they changed the Gen 3 mags & all Gen 3 work with the same CMMG Lower that the early first gen. Mag.. The Mag sits higher in the Mag well & I have measurements if you want them . You will be surprised at how a couple of thousands of an inch with make a difference . The Gen .3Mags are clearly marked " Gen. 3 ", I have a thread around here all about it , if I can find it . Not saying its your issue , but might want to check it out . Edit : I see the mag in your photo is a Gen 3 , so that can't be it , but tolerance stacking can be , between the two different manufacturers Receivers . It is why I will only buy Receivers as a set by the same Manufacturer.

Thats too funny ! I can agree with them on one point ( maybe not your Lower ) but some of the 80% lowers could be out of spec , be it by the final process or the manufacturer , so I can see some Tolerance Stacking issues . But that has nothing to do with a Barrels Gas Port too large ( which in itself can cause cycling issues from being over gas'ed ) but a blown apart Gas Block . All those Components are in the Upper , not the Lower . If you can send it back for replacement , repair or refund , I would do so just because it is out of spec's & with that Gas Block , dangerous !

I kinda doubt it , any more than Hitlery will get charged with anything other than being the stupid cow , that she is .

If I give false information to the authorities , I would be in trouble , if they find anything false about this, I'm sure we will not find out about it . http://www.oregonlive.com/oregon-standoff/2016/03/oregon_standoff_fbi_agents_und.html

" The photos show the Bolt" IS NOT" picking up or pushing the Cartridge into the Chamber , its going over the top of the Case base & the Round is being fed partly with the Carrier or the Bolt is skipping off the Base , both can be because of short cycling , be it firing the Rifle or by hand . If it feeds from Bolt open & not from pulling the Charging Handle , even though it seems to be pulled back all the way or in firing the Rifle , the BCG is not coming back far enough to feed the Cartridge correctly . Not leaving out the BCG being out of spec's as was mentioned . Whats the Manufacturer of the Lower receiver ?

What does the mag well have to do with the Gas Block Issue ? Nothing !

I'm waiting for his new batch also , but nothing paid for yet , II'l wait for him to call me . I just talked to him last week also . I think he got into trouble with his manufacturer about pricing on the web.

I don't know , being your using the Gigging instrument , I would think your options are limited , because I would only use such an instrument if I was out of ammo . Meaning you may have to use it again & if its broken , you are knife fighting , by hand ! ??

I agree , they are stiffing us .

I'm not a fan of open prong Muzzle devices , don't care if they are quit or reduces flash . If you plan on hunting with this rifle , just know that those open prongs seem to grab things you would not think your rifle could hang on too . They seem to find things to catch on going through the woods .If you hunt in the woods , that is .? That's not a bad loading , your rifle may need a higher round count to cycle the action with that load ( still breaking in ). I don't have Chrono data on my 18" barrel yet with the TAC & 168 gr. , but will shortly . I have plenty for a 16" & 20" , all Barrels have a Rifle gas system .

I have three 308AR's , all with rifle length gas systems in three different length barrels & all have clamp on Gas Blocks & never had an issue with them & I think only one is steel ( will have to look , to make sure ) "EDIT " I just put a magnet to them & all are Steel ! Clam shell & clamp on Gas blocks are completely different in the way they attach . The problem here is a soft & weakly made Gas Block , not what its made of , far too many out there with out issues such as this & I might add the first Gas Block I have seen with this issue .

Barrel clamped into a Vice block of some sort is the only way to safely remove or install Muzzle Devices . That Barrel Extension should not have came lose with normal Torque , unless it wasn't tight to begin with , contact Troy before you try to re-install it . I thought Barrel Extensions were left hand threaded ? Maybe not all ? 150 ftlbs + on the Barrel extension . Its not all about if it HS 's correctly , it has to be correctly indexed to the Gas Port . You might get lucky & it tightened back to the correct spot .

I carrie the Shield most of the time also. Handy & conceals easily .

The Buffer measurement is a little short & Can you count the Coils on the Spring ? Check Ejector & Extractor , one or the other ( or both ) could be keeping the Base of the Cartridge from seating into the Bolt Face .

He's some more interesting reading on case sizing . CASE-SIZING ADDITION: APPLES, ORANGES, AND BANANASMARCH 4, 2016 MIDSOUTH SHOOTERS 8 COMMENTS The following 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 First, I want to thank everyone who’s reading “Reloaders Corner,” and especially those who take the time to post comments and questions. That’s the fun of the web for me: it’s a closer connection to my readers and fellow shooters. Judging from a few responses to the last couple of articles on case sizing, I’d like to offer a little more detail to ensure there’s been no misunderstandings or misinterpretations. Here’s a nice 1000-yard target from David Tubb, 11-time NRA National High Power Rifle Champion, 6-time NRA High Power Long Range Rifle Champion, two-time Wimbledon Cup winner, and current Long Range World Champion. This target was fired from prone using full-length-sized cases, with carefully constructed rounds. The rifle is a TUBB 2000 bolt-action chambered in the 6XC cartridge. Tubb sizes the case bases an additional 0.0005 smaller than SAAMI specs, and sets the case shoulders back 0.002 inches.I don’t have a lot of space here to cover all the smaller but often important peripherals associated with any larger topic. In the few hundred words I have available, it has to be a more specific treatment of a more specific thing, and that’s why I’ve been doing some of this material as series installments. There are a number of folks who claim neck-only sizing is necessary for best accuracy, and, in effect, that full-length sizing is a compromise, favoring function over accuracy. I want to use this space here this time to clarify a few potential confusions. And I’m not even really disagreeing with anyone. To review, neck-only sizing is when only the case neck, all or some portion of it, is sized to adequately retain a bullet for another firing. The case body is not touched by the die interior, and the case shoulder may or may not be set back; that depends on the die design and operator preference. The idea is to better preserve the fired case dimensions; that is, make the case more closely mirror the rifle chamber’s dimensions. One advantage of neck-only sizing comes to those who expect dozens of loadings from a case. This tactic does, indeed, minimize case stretching on subsequent firings. Mostly, do not get the impression that full-length sizing — essentially following the steps and methods I suggested in the past two articles — is short-circuiting on-target accuracy. It’s not. Not if tooling is what it should be and the operator makes the investments in money and time to gauge influential dimensions. One old accuracy trick is to reduce ejector pressure. That’s easily done in most rigs: just shorten the ejector spring, if you know what you’re doing. The author does that, or has it done, on all his rifles. The ideal amount is to have a stress-free contact of the spring against the ejector at installed height, such that the spring isn’t compressed until the ejector moves in as a round is chambered. That’s usually the minimum pressure needed to make it functional and doing its job 100%.There are some who maintain that they only get good groups from neck-only sizing, and, moreover, that they get gatherings rather than groupings when they full-length resize, or when they use factory ammo. There can be some reasons for that, and they may have something to do with rifle-chamber dimensions. A lot of factory-produced bolt-actions have fairly generous chambers; they are a little larger diameter and usually favor toward the longer end in headspace (but with all numbers within SAAMI tolerance). A rifle produced for across-the-counter sale needs to accept virtually any commercially available ammunition. If someone measures as many representatives of factory ammo as I have, it’s pretty clear that there are dimensional differences, significant differences. Additionally, it’s common to find some slightly oval chambers in factory guns. That has a lot to do with the freshness of the tooling when that barrel was reamed. So, let’s construct a circumstance where we have a chamber that’s a tad amount big and a cartridge case that’s been manufactured on the smaller end of SAAMI blueprints. And this rifle has an ejector. As soon as the bolt closes, the ejector is bearing against the case, and it’s bearing well off-center. For more clarity: rifles have extractors and ejectors. The extractor is the “claw” that rides in the case rim groove. It’s there to pull the case from the chamber. The ejector is a small, cylindrical piece that’s spring-loaded; its job is to lean or tilt the case toward the ejection-side of the action as the case is withdrawn from the chamber. It’s not commonly possible to encounter a bolt-action that doesn’t have an ejector (custom Benchrest actions and some Long Range Rifle specialty actions don’t). Here’s an ejector and here’s what an ejector does. Pressure levered against the case will warp the case. It’s a small amount — all these things are small amounts. Case-body sizing helps straighten out the “banana,” that is, a curve in the case body, making it a smaller banana.Back to the reason I said anything about ejectors in the first place. It makes a banana out of a case. This is unavoidable. The pressure steadily being put against the case base by the ejector warps the case under fire. It’s going to happen on each and every case fired. The bigger the dimensional differences, the greater the warp. Of course, as the uses and reuses add up, the nature of expansion changes. A case can warp one way, and then another way, and then another. Brass has a “memory,” by the way, and we’re always fighting that. Cases tend to follow the same expansion pattern regardless of orientation in the chamber. There are some, and I’m among them, who think case-body sizing is a good thing to help allay the effects of warped cases, when they return to a correctly-dimensioned chamber. If a rifle chamber is on the larger side, then I honestly think that neck-only sizing may be doing a better job working around it, or working with it, and that’s the primary source of accuracy improvement. I also know that little bit there will get pounced upon. The “70” on the dial indicator isn’t a measurement of anything; it just happened to be the position of the indicator. What matters is the area the indicator sweeps, measuring points about the circumference of the case. More needle movement means more warping. This pair of photos shows the amount of warp on a new case measured using a V-block-style concentricity fixture with a dial indicator. Even new, they’re not perfect.I’m shooting custom-chambered custom-made barrels in my rifles. I do not request “tight” chambers (in any dimension), but they sure aren’t oversized. I like to have headspace set to closely accommodate the case brand I plan to use; doing that minimizes case stretch from the get-go. Using a concentricity fixture that’s designed to allow isolation of points of measurement along the cartridge, it’s easy to see the warp. Spin a new case, spin a fired case. Some experiment with marking the “high” (or low) point and reinserting the round in the same orientation each time. That’s tedious but possible using a single-shot approach to firing. The point is, that after full-length sizing, I see less runout. I have also seen additional body sizing improve the accuracy of rounds destined for use in rifles with smallish chambers, and that’s one of the first steps many competitive Benchrest shooters take when they’re losing the gilt-edge on groups. For that, they use a die that doesn’t touch anything but the case body. This pair of photos shows the amount of warp on a fired case measured using a V-block-style concentricity fixture with a dial indicator. As before, the “70” on the dial indicator is just the position of the indicator. What matters is the area the indicator sweeps, which shows they are a little less perfect than the new ones above.If a case becomes a banana, it should be a smaller banana rather than a bigger banana. More technically, it’s a question of if the chambered round can sit in the center of the rifle chamber. When David Tubb designed the sizing die for his 6XC cartridge, he added an additional 0.0005 inches downsizing right at the case head area. He maintains that is a key to good accuracy at long distance. He’s also setting the case shoulders back 0.002 and running a little more “neck tension” than you might imagine (difference between sized case neck inside diameter and bullet diameter). Tubb maintains that the consistency of case expansion has been an overlooked element in accuracy. Believe me, he’s tried everything, including neck-only sizing, to improve scores at 1000 yards. And this pair of photos shows the amount of case-diameter variation after they’ve been full-length sized — the variation amount is nearly back to where it started in the new cases.If you’re running a factory bolt-action rifle, by all means try neck-only sizing. If you want to compare results to full-length sizing, just make sure you’re doing that second operation correctly.

All my AR 15's have them & I think two out of my three 308 AR's have them . I was taught to use it ,but seem not to. I can think of reasons they are there & may be good ones .

Ya, that Bayonet looks cool , but gigging one pesky Zombie will probably bend or break the Mag Tube. lol

Well, I"m a very bad reloader , because I leave Powder in mine all the time , if I plan on using the same Powder with in a short period of time . When switching Powders or emptying the Powder Measure , I just make sure I cycle it a few times for any loose Powder Granule's to drop out & load up the different Powder right after . The chance of one of the Powder flakes or what ever , mixing with another Powder , is not going to be an issue . A Garage not climate controlled is going to cause havoc on your reloading equipment & constant attention will be needed all the time . My old Redding , has a removable Powder holding Tube & I can wipe it & the Main body out with a Paper towel , if needed . I can tell you , I haven't done it in years .