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1/25/2018 7:38:29 AM
Posted: 3/11/2006 9:08:46 AM EST
[Last Edit: 4/2/2006 6:40:36 AM EST by jackal2001]
What it is. RRA Upper, B/BCG/CH, Lower and a bushmaster 20" Chrome lined barrel. A2 stock.

Gun is empty bolt back, insert a mag, hit the bolt release, and this is what happens. Now I have tried 20 and 30 round mags all D&H with magpul gen 2 followers and it still happens. I have to pull back on the CH and let it hit the round again and it will push it in. After the first round is fired the gun will function normally. This will happen with only 5 rounds in either a 20 or 30 round mag.

I have been playing around at home and loading a 20 round mag up with 20 rounds and manually cycling the entire mag and it still does it almost every round.

I have also tried the same mags in my bushmaster M4 and I have no issues what-so-ever. One thing I did notice is my bushmaster has a collapsible stock on it and the gun that has the issues has an A2 stock on it. The bushmaster with the collapsible stock seems to go forward with a lot more force than the full A2 stock. Could it be that I need a heavy wolf spring??? Both guns have normal buffers.

Any ideas?

Link Posted: 3/11/2006 2:27:02 PM EST
Anyone, Anyone, Bueller, Bueller???

Any theories???
Link Posted: 3/11/2006 5:18:52 PM EST
Link Posted: 3/11/2006 5:21:58 PM EST
Link Posted: 3/11/2006 5:36:57 PM EST
Link Posted: 3/11/2006 5:55:57 PM EST
Checked everything and it is ok. It has the A2 buffer and spring, it was lightly coated with CLP and there was no burr on the roll pin in the buffer.
I let the bolt carrier group drop into the barrel by gravity and it wasn't binding anywhere.

I think it may just be a weak buffer spring. I pulled my bushmaster lower on this upper. My bushy lower has a vltor stock on it. With the bushy lower on this upper the rounds strip for the mags fine. I can also feel a heavier pull required to pull back the CH when I have the other lower on.

It may just be a weak A2 buffer spring. I was looking at the wolf extra power spring and that may solve my issue, but..... may lead to cycling issues with low powered ammo. I can try it for $14.
Link Posted: 3/25/2006 12:12:33 PM EST
I have a new build that was doing this exact same thing. I pulled the stock LMT spring and swapped in an extra DPMS spring that I had and that did the trick. Both springs came out of carbine stocks (LMT 5pos, DPMS 6pos). The LMT spring was about an inch shorter than the DPMS spring. I found that odd but I don't have another LMT spring to compare it with. I'll just replace the spring with a Wolff extra power.
Link Posted: 3/26/2006 5:17:32 AM EST
I got my wolff extra power spring and so far it has seemed to solve the issue with hand cycling and letting the bolt fly from hitting the release. I haven't had a chance to get to the range yet so hopefully I won't have short stroking issues.
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