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Posted: 4/7/2012 9:34:10 PM EDT
I bought a new REC - 7 (5.56) a week ago, but I am having a problem with it. Every time I rack the bolt it jams. It seems like the nose of the round that I'm trying to chamber is getting stuck on the locking lug cutouts above the feed ramp. I have had the bolt carrier apart for lubrication. I thought it may have been possible that I assembled it incorrectly, but I've looked at it numerous times and don't see anything wrong with it. I have also tried my bolt in my friends rifle and it functioned fine with no problems. I can get the rifle to chamber by racking the bolt an additional time. The spent case seems to eject fine.
The problem seemed to start when I was sighting in the rifle. Everything was working correctly and I had no problems chambering rounds. Though I only had three in at a time ("range rules"). I fired a magazines worth of rounds with no problems. Part way through the second magazine it got caught like it does when I rack the bolt now. I had no problems chambering rounds before this. I'm not sure what the problem is as it is a brand new rifle. I am using P-mags and PMC .223 bronze so I don't think it is the magazines or ammunition. Any help would be much appreciated.

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Posted: 4/8/2012 2:32:06 PM EDT
[Last Edit: 4/8/2012 2:36:00 PM EDT by Dano523]
Pull the firing pin from the bolt, and look at the front edges of the stop collar on it. Could be that the hammer is catching the FP collar, and what is locking the B/C up the forward stroke.

If that is not the problem, then pull the Buffer and spring out of the receiver extension, and check the end of spring coil winds that may be scrapping down the inside of the tube, and causing the problem. Before you put the buffer and spring back in, make sure to CLP lube the parts.

From here, pull the bolt out of the carrier, and with the carrier alone, insert it into the upper receiver all the way forward to confirm that the gas tube is correctly aligned with the carrier key. If need and you need to correct the index of the two, tweak the gas tube over the top middle of the barrel to correct the alignment.

As for confirming that the rifle is full stroking from the start and not the problem, single round a mag, the mag inserted/round charged leaving the empty mag in the rifle, the fire for effect to confirm that the bolt locks back on the bolt catch. If it does not lock back, pull the rifle down to clean it (with something else that Hoppes cleaning solvent since it leaves behind a residue that causing fouling problems just way too fast), including using a chamber brush by hand with CLP to clean the chamber, then lube the B/C inside and out on the wet side, insert and empty cycle the rifle a few times, which will transfer the CLP from the B/C to the upper bearing areas (CLP is the cleaning and lubing agent of choice for the platform, while the bore will need something a bit stronger to clean the copper out, and will find that something like Sweets 7.62 cleans copper out of the bore without a lot of scrubbing, and does not leave any residue behind). After such, then try the single round stroke test alone to see if this a cleaning and lubing problem alone.

P.S. Welcome to the site!!!
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Posted: 4/9/2012 6:02:22 AM EDT
I had the same problem with my PSA m4 using PMC 223 55 gr. Switched to Federal XM193 and Federal 223 55 gr. and it worked like a champ with no problems at all.
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Posted: 4/9/2012 9:28:03 AM EDT
[Last Edit: 4/9/2012 9:28:40 AM EDT by Krieg]
Thank you both for your quick replies. I believe I figured out what the problem was. It was the rough edges (I'm guessing from machining) on the locking lug cutouts that were catching the rounds. I gently went over them with a needle file and now the rifle is running with no problems.