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grantoga
04-04-12, 22:34
Anyone have any experience with the 10.5" PSA complete uppers? I havnt seen any reviews on them yet. I have a PSA m4 upper that has been great. I'm wondering if the 10.5s are functioning ok. Anyone know the gas port size on the 10.5 psa barrels?
Iraqgunz
04-05-12, 05:24
Most companies will not publish port sizes. If you want to know I suggest that you contact PSA and ask.


Anyone have any experience with the 10.5" PSA complete uppers? I havnt seen any reviews on them yet. I have a PSA m4 upper that has been great. I'm wondering if the 10.5s are functioning ok. Anyone know the gas port size on the 10.5 psa barrels?
grantoga
04-05-12, 07:28
I heard back from them and was told that they are .063. This seems very small for a 10.5. Smaller even than an LMT. The guy told me he used a micrometer to check, so I wonder how accurate he was.
Iraqgunz
04-05-12, 09:56
If I recall correctly the M4 is around .063. MK18's should be around .068-.071 range.


I heard back from them and was told that they are .063. This seems very small for a 10.5. Smaller even than an LMT. The guy told me he used a micrometer to check, so I wonder how accurate he was.
BC98
04-05-12, 11:44
I heard back from them and was told that they are .063. This seems very small for a 10.5. Smaller even than an LMT. The guy told me he used a micrometer to check, so I wonder how accurate he was.

Unless he's a machinist (I find that many I've known have extremely good judgement of measurements), it may not be that accurate. The best way to measure is using a set of pin gauges. The guy you spoke with could have easily been mistaken and the port is closer to the spec IG gave.
munch520
04-05-12, 12:41
Most companies will not publish port sizes. If you want to know I suggest that you contact PSA and ask.

They won't tell you. I thought someone here had measured and thrown out .072? Search the forum maybe you'll find that.

As an aside, my 12" PSA upper is in the .067 range.
Joerenew
04-05-12, 18:46
Psa uses fn barrels maybe that will help determine the answer
grantoga
04-05-12, 19:12
Thanks for the info guys. Munch520, how do you like your 12" PSA? Any issues?
munch520
04-05-12, 20:04
I'm waiting on my stamp. But it's living on a buddy's lower and at a low count (500 rounds) 0 issues. Very soft shooting.