Originally Posted by
1168
-Somewhere just north of 10k. Its started to slow down on the chrono, and the distant targets are starting to get less consistent hits.
-I still haven’t attempted to benchrest it.
-I’m currently using a Colt rifle spring, as I’ve concluded all the “experiments” with the Tubbs, for now.
-internet tells me 0.067”, which would make sense. I’ve put a regular gas tube in it as it will no longer be a full-time suppressor host. With that, there is a little more drama with a can than I remember from when it was new.
Correction: I recently had to tighten up one of these on my 9mm SBR lower. I don’t know why it would matter, but that lower is well used, and one day I twisted the stock a little and it moved.
Update on this one. Its now using a regular gas tube, A5H2, Colt spring, CD OWL, Troy front sight, modified Griffin muzzle device, BCM charging handle. As noted above, the barrel has aged to the point that I’ve pulled the gun from first-line status. I’ll get another year or so out of it as a backup/CQB gun. I pulled the IR stuff off it and it just wears a light up front now with more rail covers. Its still an awesome CQB peice and handles like an extension of my mind. I put the index nub from a Magpul fingerstop kit on it.
In the process of updating the gun, I found that the bolt wouldn’t extend no matter how hard I flicked it. A drop of oil on the hole that goes to the bolt tail cured that. You’ll see why that matters in a bit.
I shot 100 hammer pairs with it yesterday, using all 5 A5 buffers, and decided on A5H2. It gave me the fastest splits on the timer. Much better than the A5H4 and A5H3, and a little faster than A5H1 and A5H0. My process was to set the beep delay to random, place a 3” sticker in the A-Zone, and start each pair holding the sticker while waiting for the beep. Then fire a pair as fast as I can get A-Zone hits. I got 3 misses (B/C) in roughly 200 rnds, which I excluded from my average times for the purpose of testing buffers. I did find (too late) that I had to lower the minimum time on my timer, because I had 7/8 of my first pairs .11 splits with the A5H2, and that seemed suspicious. Turns out it was set to read .11 at a minimum.
I did have one failure to acheive battery on the first round from a full mag with the A5H4. It was the first mag of the day. I have since lightly cleaned and lubricated it. Much smoother now.
Can you go more into this?
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"I have never heard anyone say after a firefight that I wish that I had not taken so much ammo.", ME
"Texas can make it without the United States, but the United States can't make it without Texas !", General Sam Houston
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