M14 :: Slow Action Cycling, Getting Stuck / Resistance

dsynk

dsynk

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I've been cycling the action on a new m14.

When i pull the oprod back and cycle the action slowly, around the 2"/2.5" mark there's a bit of resistance.

From there, if you give it an extra tug, or cycle the action hard all the way with the op rod, it cycled with no problem.

Is this normal or is the action supposed to be smooth when you cycle it slowly?

D.
 
Try this, remove the action from the stock, remove oprod spring and guide. Tilt the action muzzle up, the op rod and bolt should go smoothly back. Tilt the barrel down, the op rod and bolt should go smoothly into battery. If it fails either way, then you have a problem.

Scott
 
What M39a2 said. If that is a pass, try again with the oprod guide, and spring out, but stock on.

Other then that, are you sure that you have all of the cosmo out? I bought a used m14 from a guy who swears that he put something like 250 rounds through it. When I got it, there was cosmo in the gas cylinder, action, stock and chamber. IF you have cosmo in your stock, you may pass M39a2's test, but fail the one above.

I am not 100% sure what you mean by an extra tug either though. You may be describing normal cycling of a 14, but it sounds like your op rod is banging on the barrel.
 
remove the trigger group and try the same thing. If the resistance is still felt, it was not the bolt riding the hammer.

2 things...
check for barrel index.... the splines/grooves that the flash hider and gas assemby mate to, should be aligned at top dead center to the receiver. often if the barrel is out of index it can ceate pressure on the oprod causing it to bind on the land of the receiver the oprod slides on.
check this area of the receiver for wear.

I have seen a few rifles now , with correct indexing, that have needed treatment with a fine file and emery cloth to the receiver land under the oprod to allow for smooth operation.

if this is a new rifle, with correct indexing, i would fire a couple hundred rounds prior to attempting to work on this area of the receiver as it may just be a couple small burrs and these will flatten out with firing.
 
Thanks for the prompt replies everyone.

I took the rifle apart and cycled it like m39a2 suggested. Cycled smooth as I was hoping it would initially.

Put it back together, same problem.

Took the trigger group out like 45acpking suggested, and it cycled smooth immediately.

Ghostsaww was spot on with this one.

45acpking: we had this one checked for index at the clinic, so i think it's just heavy bolt ride on the hammer.

I'm assuming this will smooth out after a while?

Thanks for everyone's prompt replies.

D.
 
:rolleyes:

Dumb suggestion, but I'm assuming that you greased:

1) bolt raceways, bolt lugs and op rod track
2) op rod guide (figure 8 thingamajig under the barrel halfway towards the gas cylinder assy)
3) Hammer nose and hammer face where the bolt ride backwards
4) bolt roller and also the inside of the op rod hump, where the bolt roller is cammed (rotated)

Next thing.... did you download my video for free, it's at the top of the forum with the sticky(ies) ??

Further thing... did you read our sticky(ies) so that yer #### (well you know what I mean)..... :evil:

:cheers:

Barney
 
Assumptions on the greasing are correct. We did all the good stuff at the clinic.

I searched for the issue but came up blank, hence the question here.

Stickies haven been read, but not in a while. I'll make a habit of reading them over again every few months to keep refreshed.

D.
 
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