I use the one piece cylinder/cylinder head from SHS in my ICS M4 and have had great results. But I agree with what Stealth said, they may not be a good fit for every mechbox due to variations in tolerances. It shouldn't be too difficult to get a good seal with a seperate cylinder/cylinder head as long as the cylinder head is decent quality. Ones with 2 o-rings are best, and Teflon tape around the cylinder head can help too.
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