All the trends lately have been leaning towards small as possible gas ports if running 100% suppressed. I had a Colt 6921 upper laying around and decided to have it chopped to 10.3" without the gas port being opened up. I sent it to Adco and had it back in 6 days, kudos.
I put it back together over the weekend and went to the range today to try it out.
Specs
SBR LMT lower
H2 buffer
Relatively worn factory recoil spring (4,000-5,000 rounds)
BCM BCG
Colt 6921 upper cut to 10.3 with UNMODDED gas port (factory gas port, not sure on size)
GemTech HALO
M193 ammo
I first fired 5 rounds into paper to double check that there was no keyholling etc.. All was well here so I decided to move on with testing. The first 5 rounds all fired and cycled fine without the suppressor, cue my surprised face. I really didn't think it would cycle with the unmodded gas port. I finished the mag (un-suppressed) and it locked back on the last round, cue second surprised face.
I then attached the can and ran a few mags through it. All functioned 100 percent and it was pleasant to shoot. I know Gemtech doesn't rate high on the Gucci scale (I have other cans) but I was pleased with how it did on the shorty. I built this upper to run 100% suppressed and this can will "live" on this upper for the most part now. I realize this is a small sample but it's a start.
I will update this thread in the future as time allows me to get to the range and report back on results.
ETA: OMG my Colt upper is purple...I just saw this in the picture...what will I ever do....lol!
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