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Posted: 11/2/2002 11:37:54 PM EDT
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Hello, I just had a chance yesterday to get to the range and fire my first AR15. It is a RRA M4 Entry. It shot fine. No jams, no misfeeds, but this was the problem. It appears that the bolt doesn't go back far enough to allow the bolt catch to latch onto the bolt head. It catches on the bold carrier. I had to pull the charging handle every time I changed mags. It looks like the bolt just won't go back far enough, like its maxed out. I took my upper and fitted it on my friends Colt M4gery and it worked fine, which makes me think the lower is my problem, but still am clueless. Can anyone help? I would very much appreciate it. Thanks, SFG |
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I'm sorry I described the problem wrong. If the bolt wasn't going back far enough it couldn't cycle the rounds right? :) The problem is the bolt catch is not catching the bolt at the head and instead on the bolt carrier. So when you look into the chamber you see more or less the entire bolt head. This happens even when there isn't a mag in the rifle. Any help is appreciated. Thanks, SFG |
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When you switched uppers did you use the same ammo and mags? What ammo and mags were used? Did you try shooting his upper on your lower? With an empty mag in the gun, does the bolt stay back when you pull the charging handle? If the problem really is your lower, the only thing I can suggest is the buffer tube assembly. Possibly the wrong buffer/spring for the entry stock or may need some tuning. I don't know much about that entry stock though... Good luck 
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You can't physically lock it back on the bolt-head itself when you manually press the bolt release and retract the charging handle all the way? If failing to lock back completely on the last round, Id be inclined to look at weak magazine springs, or even dirty magazines. Especially if you used the same mags in BOTH lowers. |
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http://www.geocities.com/metalgearjason/problem1 The above pic is how it looks with the bolt locked back http://www.geocities.com/metalgearjason/problem2 The above pic is how it looks with the charging handle being pulled to the max. http://www.geocities.com/metalgearjason/problem3 The above pic is what my friends Colt looks like with HIS own bolt, etc. -------------------- This is my first AR and apologize for not being able to explain better. Any help is appreciated. Thanks, SFG |
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The bolt latches back on the last round fine. After inserting a loaded mag info the rifle with the bolt locked back, I would then depress the bolt catch and the bolt would scrape along the top of the round and lock foward (not feeding the round). I would have to fully pull the charging handle to the rear and release, chambering a round. It shot fine. I just can't figure this out. Any help is appreciated. Thanks, SFG |
| I'm going to guess that your buffer spring is too long or the buffer itself is too long. I just pulled my RRA out and I can get it to catch in the same position as yours, but it will not stay there when I let go of the bolt catch button. Of course when I pull further back it catches in the correct spot. |
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I forgot to mention that when its locked back in the only place it will lock back, it is how do you say... unstable. The bolt would release if I just shaked the rifle alittle bit. I just put my friends Colt upper on mine and it won't lock the bolt back at all. It will kinda catch exactly where it catches mine, but won't hold it. Any help would be appreciated. Thanks, Jason |
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Wouldn't adding the spacer make the original buffer spring too short? SFG EDIT: Oh oh I get what your saying. Nevermind. Your saying the original buffer spring was too long to begin with right? Adding the spacer eased it back a bit, but still too long. So what maybe happened was when the extender was put in the new buffer spring that was put in was too long for it. Does that sound right? |
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My friend and I just discovered the real problem. Let me try and explain this right :P The top screw that held the stock to the buffer tube goes to far in and pushs the buffer way to far foward. After taking the stock off, everything worked fine. So I guess now I have to get a shorter screw unless there is a better solution? Any help is appreciated. Thank you everyone that so quickly came to my aid. Thanks! SFG |
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Sorry I got here too late to help, but I read this thread & its a common parts mistake: The A1 & the A2 are different lengths and there is a spacer involved. All too often when switching to the shorter stock withut the spacer, the long screw is still used. It protrudes into the buffer tube and prevents the buffer from full rearward travel. |
| I wonder if this may have something to do with a problem I'm seeing on my Bushmaster. After I put the RRA LE Entry buttstock on my Bushy M4gery, I went to the range. After about 150 rounds the rifle started what seemed like short cycling. I would fire a round, the bolt would not come back all the way, and the bolt would jam on top of a partially stripped cartridge on top of the magazine. I had not seen this problem while shooting with the original fake folding stock on. Any help obliged. |
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