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Posted: 3/10/2010 8:44:22 PM EDT
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New rifle: 14.5 midlength with M4 feedramps, std carbine buffer and spring. Pinned FSB.
About 250 rounds thru it now so I'm not sure this could still be a break in problem. What's happening is the first 3-4 mags all feed fine (10 rounders - I'm in cali) after that I'll get a failure to feed and it's always on the second to last round in the mag regardless of whether I start out with 10, 8, 5 rounds etc in the mag it always misfeeds with 2 left. (unless I put only 2 rounds in the mag to start with, then it's fine) Tried 4 or 5 different mags (all Pmags) a couple of which are new - no difference. The second to the last round either stove pipes or fails to feed at all and comes out still in the mag with the round tilted up. Bolt locks back every time after last round so no issues there. Ejection pattern is at 5 o'clock - 8-10 ft out. Anybody got any ideas? |
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mind you that im no expert, but what kind of ammo are you using? i know that with some of my handloads i had a similar problem with the bullets being seated out too far (my fault) they would hang up the follower in the magazine. the tips of the bullets had a lot of pressure on the front of the mag. doubtful, but its worth a shot. nothing else that i can think of. sorry. |
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Running the upper bearing areas on the wetter CLP side is going to be your friend to solve the problem.
The rifle is fouling out as you go to break it in, which is causing a bit of short stroke, resorting in what was once a great stroke during the first mag, to one that is less then stellar as the new/tight rifle starts to foul out (read less then full hard stroke as it fouls out, translates back to the less of the helping buffer to the back of the receiver extension tube to Jolt assist the mags recovering correctly. Also, during break in fire, if you run into problem again, pull the B/C and CLP relube it again (both inside and out). around the 1k mark, the rifle should have broken in through live fire and cleaning, and you can back off on the amount of CLP you use to lube the rifle. And, if you have not pulled the mags down to give them a good CLP cleaning, now would be a good time. Even new, since you would surprised what kind of debris that you find in new mags when pulled right out of the wraps. P.S, if you need a source for CLP, BreakfreeCLP in the 16oz spray can is your best bet. Not only will you be using CLP to lube the rifle, but to clean everything on it as well (short the barrel bore, and a good copper solvent like Sweets works very well for the platform since unlike Hoppes, it does not leave a film behind that once mixes with CLP, becomes a gooey mess causing problems in itself (read short stroking). |
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I am primarily shooting reloads but I am careful with sizing and made sure I used a good solid charge with the last batch I cooked up plus it's doing it as well with factory Rem .223 ammo. I think Dano has hit the nail on the head as I notice the problem is somewhat minimized after pulling the BCG at the range and giving it a quick cleaning. I am running it fairly wet with CLP and I will pay more attention to that during further breakin. I'll also take that advice regarding the mags as I've never really done much maintenance wise to them.
I'm curious would a different mag with possibly more spring pressure make a difference or are these pretty standardized? again Thanks! |
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