User Panel
User Panel
User Panel
PA, USA
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Posted: 8/2/2024 1:07:43 PM EDT
Hey guys, thanks for your advice here. This hasn't happened to me before and I was able to replicate it 3 times in 5 minutes today.
I was shooting out back and shot some rounds through my AR-Stoner 20 round mag. Shot the second to last round, and then on the last round the trigger wouldn't pull. Flipped the rifle and saw the last round sitting loose on top of the mag, and the bolt catch stopping my bolt, as if the mag was empty. Thought it was a fluke, but it happened again and again. Swapped bolts, and it still happened. Further testing helped me realize it is also happening on my two Duramag 20 round mags, but none of my PSA aluminum 30 round mags or my PMAGs. So, it's not happening to one specific mag, but it is only happening on my 20 round mags. Took it into the shop and I realized what is happening. It looks like, on the last round, the mag follower is still low enough to allow the bolt to move forward, but high enough that it is now catching on the "shoulder" of the carrier group right past the bolt. Picture below pointing to where it is catching, rather than at the face of the bolt as it would on an empty mag. First picture, pointing to where the bolt catch is catching the shoulder of the carrier, not the bolt face: https://imgur.com/a/w3xdjh6 Second picture, showing what it looked like on my rifle. Notice again the catch is grabbing the carrier and not the bolt face. Only happening on 20 round mags: https://imgur.com/a/2ImJEGu Any idea what is going on here? My only thought was that the bolt catch was maybe getting gunked up from a lot of suppressed shooting and I need to lubricate it more. Out of time to shoot today though so can't keep testing it out. Googling isn't showing anyone else with this occurence before, or at least I'm not typing in the right terms. Appreciate your input guys! |
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Posted: 8/2/2024 6:06:12 PM EDT
[#1]
Pull mag apart to clean with CLP, check weld points on mags to make sure smooth/follower not biding up on then as it rises, and check anti tilt follower for skirt flashings that may need to be razor removed, and spring that may be weak as well.
Once cleaned and back together, need to install 2 rounds, push down on the fronts, then middles, allow the stack to come back up on its own, and verify that top round is flush against entire mag lip. Now install another round and do the same. If mag fails this, then could play the spring tweak game, or just either send mag back to be replace, or just trash can it. Bottom line, enough actual approved goverment USGI mag manufacturers that supply to the government on the market that are proven to work out the gate, so why screw around with a mag manufacturer that may not have the mags up to snuff to begin with. Note, don't confuse some mag contractors that may have had a government order for mags, but was so long ago and did not get another contract for mags after that order was completed. Hence change who they had manufacturing them back then to someone else, so not the same mags that government was getting, verse what they are selling now to the public. |
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Posted: 8/2/2024 6:55:49 PM EDT
[#2]
When I first built my AR10, it would do that. 100 rounds later, it cycles fine. The bolt just wasn’t cycling smooth enough and coming back far enough to get behind the catch all the way.
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SD, USA
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Posted: 8/3/2024 2:42:49 PM EDT
[#3]
I had that after the last round was ejected. Turned out to be undergassed.
This sounds like the BHO is full of shit keeping it from seating all the way down and/or a weak spring. I’d take it out to clean it out and replace the spring and detent if it were mine. |
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