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12/25/2007 2:01:03 PM EDT
Hey I know this is a noobish question to ask but I have several questions about upgrading my AR. I currently have a stock m4gery bushmaster with minor add ons. I have purchased an aimpoint compm2, ggg backup iron sights, and i've changed out the extractor and the extractor spring. I'm pretty new with the AR and other firearms for that matter and I was wondering what I could do to increase the performance on my AR; for example increase in reliability, durability, and over all performance. I was thinking maybe changing out the bolt carrier assembly or even change out the trigger group (but I would have someone else change this for me if I decide to).  I was wondering if this would really help and if so what companies would you guys prefer.
The reason i'm asking this question is that my AR once in a while has a jam problem. It doesn't stove pipe but it feeds a round before the empty casing can get out. I think this called double feed or maybe thats something else. Well maybe this jam is caused by something else but opinions would be greatly appreciated.
12/25/2007 2:06:08 PM EDT
[#1]
If it's feeding another round before the last case can extract, it sounds like it could be an issue with your magazine.  I'd try using a different magazine (maybe pick up a PMag, they're gaining quite the reputation for reliability) and see if the problem persists.

I'm pretty new to this whole thing so I could be totally wrong, but worst case you end up with another mag and trust me, you'll collect plenty of those soon enough
12/25/2007 2:12:21 PM EDT
[#2]
Could be mag is letting a round loose, but it sounds like the extractor isn't holding on long enough.  Could be a weak spring or just a poor pawl on the extractor.  Since you changed the extractor and spring, that is where I would look first.
12/25/2007 3:55:22 PM EDT
[#3]
yeah i changed the extractor and shot it the next day. I didn't shoot a lot, about 40 rounds and didn't have a jam that day. But who knows. Well would you recommend a new bolt carrier assembly? And if so what brand is good?
12/25/2007 5:58:16 PM EDT
[#4]
Here's what I did to my M4gery 16" carbine to increase its reliability.

I got a LMT M16 BCG when I first bought my carbine and I upgraded it with Bravo Company's bolt extractor upgrade kit.

The main part I like about the upgrade kit is the 5 coil high quality chrome silicon material, heat treated to stress relieve the product and shot peened to add increased strength.

Make sure you have a properly staked bolt carrier key screws, you could have it done or do it yourself or get it already done at the factory with brands like Colt, LMT, BCM (Bravo Company), and others.

I'm using a heavy buffer but others are using heavier H2, H3, and the heaviest 9mm buffer, my heavy buffer is running fine so I don't need to change it to a heavier buffer.

Carbine buffer tube castle nuts should be staked, some brands don't do it, have it done or DIY.

Good quality mags like Magpul PMAG or USGI with Magpul anti-tilt followers with good quality ammo.

Last thing is keep it well lubed.

I've been using AR carbines since the mid '80s and had been lucky so far, not many problems at all, my carbines are my favorite.
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