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Old 01-22-2014, 19:16   #1
Junior Member
Join Date: Oct 2000
Location: Marietta, GA, USA
Posts: 13
Short Stroke problem

Shooting buddy has a new DPMS 20 inch barrel AR in 5.56. Right out of the box it would short stroke every couple rounds. After checking the whole gas path and resetting the gas rings it improved but not completely. We tried many magazines and several types of factory and GI ammo. The dealer tried it an pronounced it good but the problem persists. Anywhere from 20 to 50 rounds it will short stroke every time and trap the next round with the front of the bolt. Short of sending it back to the factory, any suggestions?

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Old 01-27-2014, 11:33   #2
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Join Date: Dec 2009
Location: Roaming
Posts: 538
Check the gas port in the barrel, it should be .093 or 3/32" or a rifle gas 20".
Some cheap ammo is known to be weak. If Winchester White box doesn't cycle there is a problem. If you want to use weaker ammo like 223 then you may need to open the gas port to .096 or .098. Use wire sized drill bits from a machine shop supply like Travers, MCS, Grainger etc.
The 6.8 is the fastest growing cartridge and #1 choice for hunting deer and hogs with an AR15.

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