sixsixnine

Welcome!

Just my $.02, but I've gotten far better results from tuning my ammo, buffer, and spring weight than I ever did from a comp or brake on a 16" barrel.

You mentioned in your initial post that your goal is to create enough gas to work a comp, but I've had way better results (in the AR platform, at least) from a fast powder like TiteGroup with a lighter spring and less reciprocating mass than I ever did from trying to work the comp on the end of a 16" barrel. Just my $.02

^^ That's crazy, man. I've never heard of that 25k service life before.

I noticed the same thing when I was developing a load for my MPX. Lower charge weights of CFE around 130 PF were leaving unburnt powder in the upper. Loading it a few tenths of a grain hotter (closer to 138-140 PF) resulted in a more complete burn.

147 gr. Xtreme Plated HP 3.8 gr. Autocomp 1.13" OAL Averages 901 FPS (132 PF) out of my Gen 2 MPX Carbine I've put thousands of rounds of that recipe through my gun with zero issues.

Getting permission isn't all that difficult. It's a simple notification form sent to BATFE. The real issue is that SBRs are illegal at the state/local level in certain areas.

Sig literally calls it the "MPX PCC."

I have two of the new Timney triggers in my Gen2s. Have about 1k on my main gun and 500 on the backup with no issues so far.

I'm just gonna throw this out there, but PCC-only matches are super fun. Last year's AZ PCC Championship had several stages with 100+ yard shots, tiny high value targets, and a few huge penalty no-shoots. I'd shoot that match again in a heartbeat.

I smell harassment

I ordered a few thousand projectiles from them earlier this month, and they were at my door 3 days later.

Just did the same thing. $.08/round shipped for 147 grain 9mm isn't too shabby. Happy thanksgiving.

1.10 seems really short. If that gun is working well for her, have it reamed. Otherwise, hock it and buy another Shadow 2.

Brass balls right there.

I agree.

I don't run factory ammo, and I don't use any recoil reducing devices. Standard springs on a CZ Custom steel guide rod. My .40 major load is a 200 grain bullet moving around 850 fps. My 9mm minor load is a 165 grain bullet moving around 790 fps. Both of those are significantly lighter than 'standard ammo from Magtech.' I've got roughly 10k rounds on my current slide stop, and it still looks fine. No broken lugs, no broken barrels. Nothing like what you're describing. I keep an extra slide stop in my range bag, just in case, but so far so good.

"Long slide models" would include the TS and TSO.

Dat power factor tho. I can't imagine going that long without cleaning. That crud buildup would be festering in the back of my mind the entire time I'm shooting. I'll usually field strip after shooting, and at the very least blow the guts out with aerosol cleaner before putting it in the safe.

The factory springs that come with the gun aren't my first choice for tuning. Spring packs are available from places like Wolff, Cajun, and CZC. For 128-130 PF 9mm, a 9 lb. spring was all I needed. For 168-170 PF .40, I use a 12 lb. spring. Each upper ejects rounds 6-8 feet to my 4:00, I've never broken a slide stop, and I don't run a buffer.

Factory ammo?

.40 doesn't work in 9mm TS magazines. The 9mm mags have ribs down the length of the body to align the smaller 9mm cases. You can fit about two or three rounds of .40 in before the rounds start getting hung up.

That barrel setup is crazy.

Going from 1.180 to 1.170 with a 180 grain bullet isn't enough to make me panic. My go-to major load is 1.140" with a 200 grain projo. But then again, I only crimp to SAAMI spec (like .423 or so). Pretty much just enough to take the bell out. You should pull a few bullets and see if you might've crimped the case through the coating/jacket. Also, +1 on the above advice of pushing the round against a hard surface to see if you can set it back by hand.