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Thread: DM4 Semi-Auto
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07-12-2019, 19:50 #61
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- Jul 2009
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Hi, I collected my 18" DM4 beginning of 2016,i have put less than 500rnds through this rifle as a trip to the range always ended earlier as planned with a spent case stuck in the chamber. Various brands of ammo, using new & used mags. I've never complained to the dealer where I purchased this rifle from, nor the manufacturer, and I'm not gonna start now. What I do need to do is find a good gunsmith on the West Coast to 'ream the chamber', hopefully that'll sort my problems. Wrt to your question, no, I would not recommend the DM4 rifle.
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07-12-2019, 20:04 #62
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- Oct 2013
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08-12-2019, 11:04 #63
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- Jul 2008
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09-12-2019, 09:23 #64
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- May 2011
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09-12-2019, 09:30 #65
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- Aug 2013
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- Potchefstroom
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Re: DM4 Semi-Auto
Hi DSG.
Would you please clarify which gas system lengths are used for the different barrel lengths on the DM4?
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10-12-2019, 08:58 #66
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- Aug 2012
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- The moral high-ground
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Re: DM4 Semi-Auto
I find it funny all this discussion about reaming chambers and what not else to correct problems on guns that should have never been built the way they were. (I'm referring to guns with carbine length gas systems on longer than the norm barrels) It is my understanding that some 18 inch guns have carbine gas systems? (Please correct me if I'm wrong)
AR's function within certain parameters. Gas ports too close to muzzle / too little dwell time / under gassed causes short stroking. Too much gas from a too large gas port overworks the system. Gas for too long (Short gas systems with long barrels) overworks the system.
Pressure needs to drop in an AR before extraction, or the extractor will slip leaving the case behind. (I didn't design it like that, Eugene did). Prevent gas pressure from dropping before extraction occurs by having a too large gas port or too much dwell time and the gun will malfunction. And whoever buys a gun from a manufacturer / assembler who doesn't understand this is wasting his money.
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10-12-2019, 10:55 #67
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- May 2011
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16-12-2019, 11:08 #68
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- Jul 2009
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