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Old October 20, 2017, 02:41 AM   #1
simonrichter
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Swap-in 22lr conversions and the gas port

I've seen a lot of videos on CMMG swap-in conversions for AR15 platforms. They seem to woek pretty decently, and obviously the much too high rifling twist in a .223 barrel is not too mich of an issue, at least for plinking. What I still dont get is whats happening with the gas port while during .22lr. The pressure might be much lower, yet still some gas will be vented into the system - where it cannot move the action since it's straight blowback. What happens with that surplus gas?
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Old October 20, 2017, 06:58 AM   #2
Mobuck
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"What I still dont get is whats happening with the gas port while during .22lr."
That amount of gas is easily dissipated under the hand guard.
IN ADDITION
The gas port is getting clogged with raw lead and bullet lube from the skidding 22lr bullet.
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Old October 20, 2017, 07:53 AM   #3
Fishbed77
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Quote:
The gas port is getting clogged with raw lead and bullet lube from the skidding 22lr bullet.
This is one of the reasons CMMG recommends (or used to recommend) firing some .223 through the rifle after using the conversion.

Personally, I don't care for the conversions. You are much better off saving up a little extra money and getting a dedicated .22LR upper.
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Old October 20, 2017, 08:04 AM   #4
simonrichter
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How many rounds are we talking before lead buildup becomes a real issue?
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Old October 20, 2017, 09:34 AM   #5
Sharkbite
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You are much better off saving up a little extra money and getting a dedicated .22LR upper.
This^^^

A dedicated upper will...
1. Run better
2. Shoot more accurately due to the proper twist rate
3. Not clog your gas system with the dirty 22lr crap

Its just an all around better way to go.
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