Long story short: My Mega MATEN is having cycling issues. The bolt rarely ever locks back on an empty mag, and most times it will cycle just enough to spit out the empty brass, but not enough to chamber a new round.
I've been playing with the gas block, adjusted it to ensure it was aligned, playing with the gas adjustment screw to see how it works at different settings. Nothing so far has led to reliable functioning.
- With a 16" carbine gas system barrel and low pro gas block on this build, I never had any of these issues.
- LC M80: Rarely ever chambers a new round after firing
- LC M118LR: 30% chance it chambers a new round after firing
- FGMM 175: About the same as the M118LR
- I have tried opening up the gas block all the way for full gas, didn't remedy the issue
- I have used both the heavy carbine spring, and the standard DPMS carbine spring. Both are definitely .308 springs btw, no mixups here.
Option 1: Loc-tite all around the Seekins block to see if it's a leak that's causing the issue.
Option 2: Put the low pro gas block back on and see if that fixes the issue. The Seekins just doesn't work well on this barrel anyway.
Option 3: Throw some things in a fit of rage then find a good AR gunsmith, exchange money for peace of mind and let him fix the problem.
Specs:
Mega MKM MATEN receiver set
Mega 20" .308 barrel, rifle length gas system, .089" gas port
DPMS rifle length gas tube
Seekins adjustable gas block
Carbine buffer tube w/DPMS buffer, DPMS carbine spring & Slash heavy carbine spring (tried both, no good)
DPMS BCG w/ JP enhanced bolt
I've been playing with the gas block, adjusted it to ensure it was aligned, playing with the gas adjustment screw to see how it works at different settings. Nothing so far has led to reliable functioning.
- With a 16" carbine gas system barrel and low pro gas block on this build, I never had any of these issues.
- LC M80: Rarely ever chambers a new round after firing
- LC M118LR: 30% chance it chambers a new round after firing
- FGMM 175: About the same as the M118LR
- I have tried opening up the gas block all the way for full gas, didn't remedy the issue
- I have used both the heavy carbine spring, and the standard DPMS carbine spring. Both are definitely .308 springs btw, no mixups here.
Option 1: Loc-tite all around the Seekins block to see if it's a leak that's causing the issue.
Option 2: Put the low pro gas block back on and see if that fixes the issue. The Seekins just doesn't work well on this barrel anyway.
Option 3: Throw some things in a fit of rage then find a good AR gunsmith, exchange money for peace of mind and let him fix the problem.
Specs:
Mega MKM MATEN receiver set
Mega 20" .308 barrel, rifle length gas system, .089" gas port
DPMS rifle length gas tube
Seekins adjustable gas block
Carbine buffer tube w/DPMS buffer, DPMS carbine spring & Slash heavy carbine spring (tried both, no good)
DPMS BCG w/ JP enhanced bolt
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