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Posted: 2/1/2007 4:19:11 PM EDT
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Very new to this conversion kit. Sorry if this question is a dupe. Does this system use the AR's gas tube to function, or is it blow-back? If it is blow-back, will the .22LR round soil the gas tube if it is left in place? Thanks for your help |
). Even if it does clog it spend $8 for a new one.
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As posted it is blowback. The easiest thing to do regarding this is use decent ammo, and blow the gas tube out with a few 556 rounds every so often, or after shooting the 22LR. You will be so busy having fun with the 22LR, that you will soon not worry about the gas tube. Craig |
The manual for the M261 calls for firing one or two 30 round mags of 5.56 after every session of 1000 or so .22 rounds specifically to clean out the gas tube. .22 ammo is significantly dirtier than most center fire ammo, though it seems to be cleaner than 5.56mm blanks. 
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My M261 manual says to clean out the gas system with 5.56 after firing 400 rounds of .22 TRACER ammo. No warning about normal .22 ammo at all. Also, when you do blow it out, you don't need a full mag of 5.56 to do it. When you fire the first shot, does it eject and feed and chamber the second round normally? Congratulations, your gas system is clean. Ain't gonna get no cleaner. If it doesn't, repeat as necessary until it does. I've never fired more than 2 shots of 5.56 to ensure that my gas system is still working. I've gone as much as 800 rounds between blowouts, now working on going to 1000. |
Here's what it says on page 2.6 of TM 9-6920-363-12&P:
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