7.62/308 XCR mags compatability issues in AR-308, Stag 10, BCL-102 ect

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SSG69

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Has anyone had any issues using XCR mags in their AR-308 platforms? I have notice in two rifles, that when using 7.62/308 XCR mags, the rounds will leave indentations just below the feed ramps.
Here are same pictures to describe what I am talking about. This picture is of a BCL 102 Gen 1. This was after 250 rds. Obviously this is rather softer metal compared to my Stag 10

3UbkP2n.jpg


This is the Stag 10, although this has fewer rounds put through it, it does show some marring.

ovWTgC0.jpg


Below are comparison of the XCR mag and a PMag sitting in the mag well. You will notice the difference as to how the sit, and the difference on how the rounds will feed into the chamber. Although the XCR mags will work, I am in the belief that my XCR mags will only be used in my ArmaLite. The ArmaLite AR-10 is not effected as the others were.

The design of the PMags directs the bullet into the chamber better than the XCR mags

GB3zgD3.jpg

OvJ61WD.jpg


Has anyone else noticed this in their rifles?

Paul
 
CODFan said:
Yup - see link.

https://www.canadiangunnutz.com/forum/showthread.php/1599725-NEA-BCL-102-FAQ-Thread
Click to expand...

The issue about the mags in this link is how to modify the rear. What I am describing is how the rounds get picked up and hit just below the feed ramps. Also, the fitment of the XCR mags. They sometime protrude higher than the mag well that will cause damage to the flange.

See in this picture, the front part of the magazine, the design of it does not taper in like the PMag, thus not guiding the rounds directly towards the feed ramps. This might also cause issues with accuracy due to the damage to the rounds hitting and being deformed.
XCR mag, note the arrows shoing the area of concern.
GB3zgD3.jpg

PMag
OvJ61WD.jpg
 
As the issue is in the 'front', and round might need a little bump to properly clear, a 3D printed follower with a slight bump should fix any such issues without too much time/energy/resources

I was looking for a first project for my 3D printer.. I just found one :)


Can't wait to start working on my SVT-M modern stock though!
 
If your rounds are feeding low, the follower needs to be higher. If it were my mag, I'd open up the 2 tabs on the front a bit so the front of the follower can go a bit higher.
 
Hitzy said:
If your rounds are feeding low, the follower needs to be higher. If it were my mag, I'd open up the 2 tabs on the front a bit so the front of the follower can go a bit higher.
Click to expand...

I have encountered this several times with pistol mag use with other firearms. Super easy to adjust the followers on these mags. Not so much on AK mags but Dremels do the trick. If needing a lot of adjustment start mid way back on follower with increasing ramp as you move to the front. Small changes at a time. You should be able to get it feeding like a champ.

I just checked mine and using same style XCR mag and I have maybe a start of what yours look like. Going to adjust mine slightly. I also noticed that ASC XCR mags ramp the round up on the front unlike the c- products mags. This mag maybe a good option except you have to open it up on the back end in order for it to clear the bolt. I will have to see if the ASC mags feed better. Cheers
 
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I seem to be having a similar problem with my Criterion barrelled Stag. My impacts from the tips of the rounds are very low, at the junction of the upper and lower. It appears to be the second round in the mag moving forward with the round being chambered. The damage to the tip of the second round in the mag seems to be proving this. I noticed while hunting because I was chambering and ejecting the first round so often and the tip on that round was still perfect.
 
I went out yesterday but about 50 rounds through the BCL with C-products XCR mags. I have only put 40 rounds or so prior. So the issue I had was using crap Barnaul 150 grn and non stop stove pipes. I should have just stopped but was getting decent groups at 100yrds or so. Finally got frustrated and inspected upper receiver.

Too my surprise I had some pretty good damage to the right feed ramp and the stove piping also caused a fair bit cosmetic dings in the upper. The metal is very soft compared to the FMJ and the steel shells left some good marks. So I decided to give the ramps a light file to clean up the dings. Adjusted the feed lips again on the mag. I had 10 rounds of Federal gold metal match 163 grn. This fixed the stove piping in the gun and ran pretty smooth. I was able to get a few rounds through same hole in a 3 rounds which I found pretty impressive. I also did not notice any new damage to the feed ramps in the upper but only 10 rounds of match Ammo.

So I can not complain on the accuracy as this gun is by far my post accurate. I am however disappointed in the damage caused by 40 rounds of crap Ammo. I was hoping to use this gun for multiple purposes but concerned on what it will look like after 1000 roounds. Might have to stop using the XCR mags but need to test a bit more. Also have 2 ASC XCR mags but they need modifying in order to function. Not too sure what to think about this purchase so far. Want to love this gun.
 
SSG69 said:
Has anyone had any issues using XCR mags in their AR-308 platforms? I have notice in two rifles, that when using 7.62/308 XCR mags, the rounds will leave indentations just below the feed ramps.
Here are same pictures to describe what I am talking about. This picture is of a BCL 102 Gen 1. This was after 250 rds. Obviously this is rather softer metal compared to my Stag 10

3UbkP2n.jpg
Click to expand...

It's crazy how badly damaged that BCL receiver is. Softer grade aluminum?
 
My XCR-M mag does not fit into my BCL102 receiver front to back, although side to side seems fine.
A PMag I tried does barely fit and doesn't drop free.
The supplied mag (IWI??) does not feed reliably but easily fits into the receiver.
 
In my opinion it's not the rounds that are being fed that are the issue. This is the result of the round that is still in the mag as the rifle recoils. The magpul mags actually stop the round from traveling forward under recoil. It's not going to matter what angle they get fed at as it's happening while the bolt is closed and the chambered round is fired. In allot of bolt actions this results in flattening of the exposed lead tips of soft points. Sako 85 mags actually have a guide for the shoulder of the case, and the bullets don't slam into the action/mag. The follower guide in the mag body with magpul works much the same way on .308 rds with a shorter oal than say the Austrian surplus.
 
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