survivalshop

That broad has a mega Caboose , wonder if she has to turn side ways to fit through doors <laughs>

Put a Railed free float hand guard on there & you won't notice the extra Receiver rail out front . Nice rifle , now go out & get a range report for us <thumbsup>

Here's the measurements I took from various mags for the 308AR I took a couple of years ago when I got LRPMags & tried them with this CMMG Lower when I had the 16" bbl. with it . Lower Receiver Deck to top of Cartridge case ( Loaded round in the right position of the Mag.) CMMG Lower - Gen. 1 PMag - 0.396" CMMG Lower - CProducts Mag ( org)- 0.405" ( note that these CProducts mags are from the original manufacturer ) CMMG Lower - DPMS Mag. - 0.403" As you can see it didn't take much for the PMag being lower in the Mag well for it not to function , because the CProducts & DPMS Mags worked fine. Here are the same readings from a DPMS Lower Receive & all Mags work in the Receiver(s) , because I have two. DPMS Lower - Magpul Gen.1Mag - 0.412" DPMS Lower - CProducts Mag (org. )- 0.424" ( note that these CProducts mags are from the original manufacturer ) DPMS Lower - DPMS Mag. - 0.454" ( note this is the same height as the new Gen 3 Pmag in the CMMG Lower Receiver ) With no MilSpec standard on the 308AR"s I can see the differences , The MK 3 CMMG Lower Receiver being off just enough to have a Mag brand not function reliably , we are only talking about a few thousands of an inch, to make it not work . I give Magpul a <thumbsup> <thumbsup> for making the Gen 3 mag sit up higher for it to work in this early CMMG Lower that was made before the 308LR PMag was on the drawing board . This Lower was made before CMMG made complete rifles also . There may have been problems with other Manufacturers that we don't know about , but you think we would have heard of something . The Cartridge on the right side is the one FTF , the left one feeds with out a problem , I find that odd & will look into it , I have my suspicions of why .

Nice .

That may be true , but Fuk Snopes , I don't trust them any more than the Rumors !

So what does the Buffer system have to do with the Bolt not going into battery or locking in battery ? You think spring pressure is not enough , the having to Mortar the Bolt out is a clue & has nothing to do with Buffer spring performance . <dontknow> Its the NIB Bolt , I have seen most are tight because of the coating when Head Spacing ( depends on who did the coating ). Work it & eventually the bolt will wear in enough to function properly or try another Bolt , not NIB coated , like a Nitrated one or DPMS Phosphate.

500 gr. in my NEF 45-70 would probably kick my a$$ , the 325's are bad enough . <laughs> I think those are loaded down some what from the Hornady fodder . On the 450 Marlin , Hornady is there only one that makes the ammo for it , they developed it for Marlin. The base of the case has a Magnum rim on it so it can not be loaded in 45-70 chambered rifles . 325 gr. Hornady & 300 gr. Remington

Well as far as this old version of the CMMG Lower is concerned , they made it better or should I say more functional . Hasn't been tested on the range yet , but by just cycling it , it should function fine. All my 308AR Hand Guards are 12" , I can see why some would want the Hand Guard over the Gas Block , some shoot with their hand out that far . It does add a little weight to it , may not be much , but it is weight , some thing the Barrel end of these beasts don't need . Weight is under 11# ,with out mag on this rifle .

45-70 , 325 gr. FTX , Flex tip bullet

Your COL could also have something to do with it , everything expands with ambient temp. Where was the ammo before you shot ? You are also very close to the top of the charge weight , always a danger when up to that point . Don't let the Manufacturers fool you , all powders change with temp. differences , some more than others & some safer than others .

A Mechanical Engineer among us , now all we need is the weight of the Titanium Hammer & a Geissele or std Hammer to see if it will work . <dontknow> <laughs> <munch>

Do you mean Incompetence ? <dontknow>

There are differences between the cartridge height of that right Cartridge in the Gen 1 & Gen 3 PMags & there is a difference in height or distance of where the mag Catch indentation is between the two PMags ( Gen 3 is also reinforced compared to the Gen 1 ) . I measured from the top lip of the Catch indentation & the top of the feed lip . Mag Catch indentation : Gen 1 = 1.148" +/- Gen 3= 1.168 " +/- I also measured the distance from the Lower receivers Deck to the top of a loaded mag with two rounds in it to have the round on the right side of the mag. Gen. 1 = 0.393" +/- Gen. 3 = 0.454" +/- As you can see the Gen. 3 is set up to have the mag higher in the mag well , in which its set that right cartridge up higher in the path of the Bolt for it to be grabbed & fed into the chamber . These readings are not exact , but as good as I can get with my Digital Caliper & I was going to set up a dial Indicator , but after these initial readings , I see no need to . I have all the other readings I did when I first measured all the mag manufacturers I have . I have a post on it some where around here , but will dig them out & re-post for comparison. I found this very interesting , I could see when I was working the charging handle & looking in the Ejection Port , the Bolt was just barely touching that right cartridge with the Gen1 , but would roll over it & miss it .

There is usually no problems with the Modular fire control groups ( drop ins ) in any rifle I know of .

Ordered a Nitrated Bolt today from him.

Done deal on the Wilson Bolt .

I wouldn't put the modern 444 Marlin & 45-70 or the 450 Marlin in any old category , that is for sure . The new Hornady Leverevolution ammo . they are smoking rounds , I have a factory 325 gr. flex tip I Chronographed at 2000 fps. & the 450 Marlin will do a little better .

Ouch ! <lmao>

I assembled the rifle today & will take some photo's at the range , because they come out so much better . I did find out something today testing feeding with different Manufacturers Mags. As those here know this CMMG Lower Receiver will not function properly with PMags & today I actually see why . I did some work to tighten up the Receive set a while ago & redid it a couple of months ago , removing the Bedding for the real Lug of the Upper receiver . It was set up from an article I have on bedding the Rear Lug & using 0.004- 0.007 " of shims to make sure there is room for disassembly . Well I removed the old Bedding & this time I did something else , I found the front Pivot area had about 0.010" of play ( Total ) I got some Revolver Cylinder Shim bearings , made of S.S for single actions , I believe , the Bearings are 0.004 " , After altering the center hole for the Pivot Pin to fit , I placed one on each side & that worked real well for tightening up the play & for better centering of the Upper & Lower Receivers . I then bedded the rear lug again, this time not using any shim stock . I did this because the problem with the PMags was the Bolt passing over the right Cartridge in the Mag. , surprisingly that round has the hump or higher level of the Follower under it , strange . Feeds the left one on the lower side of the Follower , but misses the right one . So basically the Mag is sitting too low in the mag well to feed properly , now I will also add here that the rifle functions flawlessly with any Metal Mag . that I put in it , so its just the PMags . I tried a Amalite Mag catch & there was no change in the feeding function , so today with this rifle rebuilt & shimmed up , it functioned with my dummy loads with any Metal mag . I tried , but the Pmag was still a no go , I could get it to feed from the right side if I held up or pushed the rear of the mag up , maybe I need to try the Armalite Mag Catch again . What I did today was try one of the Gen.3 25 rd. Pmags & they worked flawlessly . My other Pmags are first Generation & I think they changed something in-between the two . Is there a Gen 2 Pmag ? I'm not sure , should be unless they went from 1 to 3 ? <dontknow>

Yes, Mass has a lot to do with functionality , as far as striking the firing pin to ignite the Primer . There is a give & take with respect to decreasing lock time , some things work with certain actions & some don't work so well .

I was expecting something like this to happen . This idiot did it before & was fined for it . I don't blame people for wanting to help , but you get a lot of wannabe's involved & this is what you get , unfortunately . <dontknow>

Thats the plan . <thumbsup> I'm ordering a Nitrated one to go with my new Nitrated Barrel . Nothing wrong with an NIB one , I just want to test it as I'm testing the NIB one I have .

My belief is that of two reasons , I believe it runs cooler with it exposed, all three of my 308AR's are exposed ( heat reflects back off the inside of the Hand Guard ) & its much easier to take off , if need be . I knew there was a reason I didn't want to go to the range today to try out my new Chronograph . Now I can try my new ( some what new ) rifle out . This is also my first Nitrated Barrel , Josh said it may take longer to break in , we shall see . <thumbsup>

I started this one to because I was pissed , I didn't get what I wanted <lmao> It all worked out , I need to order a 308 Bolt , any way .

Got my new Criterion Barrel today & its a nice piece of work , as you would expect , I have to head space the test Bolt I have & its ready to go , mocked it up & I'm impressed . First Barrel I have purchased that came with the dimple for a set screw Gas Block STD AR 15 Rifle gas tube measures 1" past Barrel Extension I wil order a new bolt from Wilson tomorrow , going with Nitrated.