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Old 07-12-2014, 10:35 PM
jlop3591 jlop3591 is offline
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Exclamation M&P10 CYCLING ISSUES Please Help

hey there guys,i installed these parts before i first shot it

UTG Quad Rail
Troy low pro gas block
Mbus Sights
Nikon Pseries Scope
Magpul flashligh mount/surefire Gx2
and Bi-pod
could i have put the gas block and gas tube back on incorrectly?
shoots 1 sometimes 2 or 3 rounds and it will either not cycle or it would jam i would have to pull the charging handle extremely hard to release the bolt or whatever is getting stuck
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Old 07-12-2014, 10:53 PM
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Targeting_Chief Targeting_Chief is offline
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Try checking this post:

Short Stroking with modifications

See if that sounds like it might be similar to what you're experiencing. If it doesn't, I would (not to say you haven't already) take the BCG apart and clean/lube everything again after firing it with the new parts. Remember that the gas tube is a little harder to get lined back in the M&P 10 than other AR-type rifles, so double check that too. I would fire it again and see if it seems like its better, if not I'd probably take it to a gunsmith for a check-up. Don't want to damage it beyond reasonable repair...
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Last edited by Targeting_Chief; 07-12-2014 at 10:54 PM.
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Old 07-13-2014, 08:48 AM
MichiganScott MichiganScott is offline
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Lack of lube with AR's is one of the biggest reasons that they malfunction. I would check the gas tube alignment also.
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Old 07-13-2014, 11:49 AM
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Gun pup Gun pup is offline
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Did you gap the gas block from the barrel shoulder, the width of the stock forend clamp?
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Old 07-14-2014, 02:03 AM
Bat Guano Bat Guano is offline
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Mine had very minimal headspace to the point where unfired in-spec military rounds were difficult to extract. Had to "mortar" them out early on but it cycled perfectly when fired.

Sometimes it's better to shoot stock quality ammo in a stock quality rifle a while before "improving" it. Mine runs just fine with a scope I had lying around and a spare GI nylon sling...
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Old 07-15-2014, 03:40 PM
tcgrmt tcgrmt is offline
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Check the gas block, if I remember right someone on here measured the gas port location and without the hand guard piece and was ok to install flush without a space. I measured my low profile gas block and the hole was large enough to be install flush. If the gas block checks out just keep shooting it and lubing it, mine would short cycle when I first got it. Now after about 300 rounds thru it I don't have any issues no matter what I put in it.
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