As I said in another thread, I just chopped my Norinco to 18 1/2 inches(plus a bit). Did the Barrie Hungry clinic about 3 weeks ago before the chop job. Took the gun out today for the first time and it's started to short stroke.I don't think its the shortening of the barrel, so it must be the gas system. I am just about to strip it down again and take a look. I put several hundred rounds thru it before this without a single problem. Any ideas?
M305 short stroking
- Thread starter dogzilla
- Start date
what type of piston are you using..... the one the rifle came with?
please let me know if you have switched to a sadlak titanium or if it is the norc standard piston. I am gathering info and comparisons on useage of the sadlak pistons. Note to those buying these...... they sell one with a NM groove..... this piston is only for use with 174 gr and heavier bullets and will cause short stroking when using lighter bullet weights.
The common cause dor short stroking in a rifle that otherwise function just fine..... is generally gas system related.
causes:
barrel gas port clogged
barrel gas port out of alignment with cylinder port
gas cylinder plug is full of crud/carbon
dirty piston port and internal tube
dirty or scored piston/cylinder wall
I'm not a 'guru', but IIRCC with the AR platform, shortening the barrel required to be changing the load.
I would suspect the shortening of the barrel would shorted the time period for the expanding/burning gas to have the proper amount of pressure to fully operate the piston, before the rnd leaves the barrel. With the idea of the rnd still in the barrel, but forward of the gas port allowing the gas to find ' path of least resistance'.
I would suspect the shortening of the barrel would shorted the time period for the expanding/burning gas to have the proper amount of pressure to fully operate the piston, before the rnd leaves the barrel. With the idea of the rnd still in the barrel, but forward of the gas port allowing the gas to find ' path of least resistance'.
I wouldn't know for sure but due to the cylinder being in such close proximity to the gas inlet, I don't think it would be a problem with the shorter barrel.
Sometimes it's the simple things you accidentally overlook.
Action should be smooth and have no bumps/kinks along the way. Cycle the action manually front to back fairly quickly and 'feel' for resistance. Make sure all the rails and friction points of the op-rod are fully lubed with grease. Check that your piston is cleaned and the tube where it resides is free of residue/carbon. The nut that holds the piston inside the tube should be nice and tight as well.
with 150 grain rounds it should cycle perfectly.
with 150 grain rounds it should cycle perfectly.
after chambering the first round and firing, the bolt loses momentum and fails to fully chamber the next round.
common causes are found primarily with gas system as explained above.... and poor fitting oprod/receiver bearing surface which cause binding on the oprods rear stroke.
this rifle i would suspect is gas sytem related as he stated it functioned fine before the chop job
common causes are found primarily with gas system as explained above.... and poor fitting oprod/receiver bearing surface which cause binding on the oprods rear stroke.
this rifle i would suspect is gas sytem related as he stated it functioned fine before the chop job
