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AR15.COM
6/11/2019 12:28:23 PM EDT
For those who run factory loaded pistol rounds thru a DI upper, how clean is it?
Assuming we're taking good domestic production ammo like Sig Elite.

I guess I'm asking cause I remember reading threads in the early days of DI PCCs and I saw some say that the gas tube would foul quickly, not sure if that was suppressed or not.
6/15/2019 12:20:39 AM EDT
[#1]
I have found that if the gas system fouls quickly, the culprit is usually a shooter who lubes with CLP....the low flash point combined with the higher gas temps from the super short gas system create an abrasive sludge that locks things up.
Manufacturer specializing in both DI and Blowback pistol caliber uppers. www.maconarmory.com
45 ACP, 45 Win Mag, 460 Rowland, 10mm, 40S&W, 9mm and 7.62 Tokarev.
7/29/2019 3:43:01 PM EDT
[Last Edit: wildearp][Edited] [#2]
Quote History
Originally Posted By Mad-Machinist:
I have found that if the gas system fouls quickly, the culprit is usually a shooter who lubes with CLP....the low flash point combined with the higher gas temps from the super short gas system create an abrasive sludge that locks things up.
View Quote
I shoot exclusively Win 231 full house loads with 230 grain plated or ball, not known for being the cleanest.  I also lube with CLP.

I haven't done anything to clean my gas tube and I don't recall if I have even taken my bolt out of my BCG in several thousand rounds.

I have an Echo II, so my .45 has seen some rounds.  When I recently changed out the upper, I noticed nothing out of the ordinary with the gas tube and simply cleaned the upper with some brake cleaner and compressed air.

My .223 weapons that I run more often with a can see much more fouling.

I do tend to do a quick wipe down of the external bolt surfaces and a cursory wipe of the internals about every other range trip.  On any AR platform I usually apply fresh CLP to the usual places right before heading to the range, when I can remember to do it, whether I clean it or not.
Let me put my meat on your grill.

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