2011BLDR

Reality is Primer production is limited even in normal times... Vista outdoor controls 70% +/- of the primer capacity in the US (federal & CCI) Winchester has been on a downward spiral in quality and capacity for several years and now has to manage Lake City as the new contract administrator stretching their administrative capacity.. Remington is bankrupt, ammo side has an offer to buy out for $65mil + assumption of debt, that leaves huge questions on the supply chain of raw materials for any new owners of Remington ammo.

Never liked the 512 interrogated mount, the height over rail is to low (Absolute co witness height) so it requires a riser, glass is so so. Reticle is not bright enough for full AZ sun. Skip any Sig optic that is not a T version, IPX 8 vs IPX 7 environmental sealing are well worth the small cost increase. Replaced 4 UH-1 with Sig R8T’s, bigger window, clear glass , super crisp reticle, windage and elevation are adjustment are internal on the reticle. Windage and elevation are adjustment are in the mount in the UH-1, I had 3 where the windage tension loosened up after 25K and you could move the sight with minimal effort left and right.

way I have done it for 30 years in USPSA is I keep mine loaded all the time until I make a decision to switch divisions for at least a mouth or 2.. down load and clean anything as needed on a stage then reload it and back in to rotation.. 2011's get new springs once a season, PCC's get new springs as needed when the springs get a curve in them..

Yea same for me in 30 years at this sport I probably have less than 5 hours total of dry fire, no routine practice might do 100 rounds of drills if I am on a range to adjust a Zero or do some chrono work 2-3 times a year... I just shoot 6-8 matches every month

STI is gone: http://www.digitaljournal.com/pr/4693452

PN: 1810939-R / OP ROD 1810942-R / BOLT CARRIER, 37 HP, FG 2402083-R / BUMPER, RECOIL KIT-MPXUPPER / UPPER RECEIVER ASSY, MPX, SEMI, DUST COVER, EJECTOR, BARREL CLAMP, HARDWARE I called a few times and was told $50 shipping on me for evaluation (whole gun) , any aftermarket parts were automatic disqualifying on a warranty request and I was well over the 25K service life of the system... I finally got someone willing to work with me and have kept him as my POC, however I am a retired military armorer and held SIG certifications for 18 years and I think that had something to do with it... Best bet is to call and try to order what you need as the MPX Upper was on the web store a few mounths ago , but not curentley: https://www.sigsauer.com/sig-sauer-small-parts-shoppers/

common issue with the Carrier and spring guide .. the cross dovetail on the spring guide is what is gouging: 1. check your ejector to ensure it is tight in the upper receiver as this will contribute to the issue 2. shift to a faster burn rate powder OR shift to a restricted gas plug (0.052")...MPX's are burn rate sensitive I normally run speer 115gr TMJ that is 1400fps with .0520 restricted gas and 13% reduced recoil springs when I go to 115gr JHP @1400fps with 5.9gr of CFE Pistol or 5.2gr of Sport Pistol I have to change to the .114 gas plug( factory Open).. when I use fed 115gr JHP +P+(9BPLE) @1450fps I need to go to a .0469 gas plug with the 13% springs all are close in PF but require different gassing. I paid SIG for the new generation (PCC/G3) Carrier and spring guide for all 3 of my MPX's as they consider the gouging normal but did change the parts that cause it.

What # of USPSA matches are you shooting per month? their is no substitute for shooting matches, will any of the clubs let you pay an additional fee and shoot the whole match 2 times as just another shooter on your squad? Are you evaluating your performance to the other divisions in HOA for the match and individual stages?

I have been shooting this sport since 1990 and never heard of the veloicty limits your talking about... early on major PF was 175 so everyone targeted 180PF for comfort..had guys running 88gr JHP @2045 fps 115gr@ 1565 fps... FYI current USPSA velocity limit for PCC is 1600 fps... the 9BPLE and XM9001 are federal factory loads out of a 13.7" barrel garentee the would be faster from a 16"

Yea ended up their after 3 years of development started with 124's with the stock flash hider Moved to 115gr after adding the MBX comp the 9BPLE Load: groups under 2" at 100 yds (100/26 yrd BZO ) matches up to the 500yard 5.56mm BDC point in the EoTec / trijicon /sig reticals @ 175 yrds for the long range targets at the AZ State PCC match only rises a max of 1.9" (@ 65 yrds) falls out of that 1.9" @115 yrds ( gives me a center hold on a 8' plate anywhare from 5-115 yards) Matches the CQB 7yd point of reference in the same recitals gives me same BZO with the XM9001 , 115gr speer TMJ and my 115gr reloads for regular USPSA matches drives the MBX comp I admit I have played around with 95gr JHP loads that I do like for just USPSA and gives me an alternate for when bullets are hard to source and factory cost is up ( now) only run them @ 1525 fps /144 PF Just saying their is performance available in the MPX if your willing to tune, just like in a blowback PCC it's just different more like an OPEN pistol or an AR ... If your killing extractor springs in your MPX your over gassed for that powder burn rate.. I git 7K or so on one with proper gassing, I have killed them in 300 rounds with improper gas best thing i did to eliminate the "MPX wants to do it own thing" was add the comp and drop the recoil spring rate

MPX’s need to be tuned just like a blow back PCC however the process is different: 115gr @ 1425FPS: Speer TMJ , Federal 9BPLE, Federal XM9001 and a N340 reload I use a 0.0520 gas plug in 2 of my guns and a 0.0469 in the third with 13% reduced recoil springs in all 3 guns 115 JHP reload with 5.9gr of CFE Pistol I use a 0.114 (open) gas plug in 2 of my guns and a 0.0520 in the third with 13% reduced recoil springs in all 3 guns Same bullet weight, same velocity, same power factor = 47% change to the gas flow based on the power burn rate

USPSA Added P226 LDC on 12/2/19... and I see them around now

I have been using slide mounted RDS since 1995-6 ish ... just adding threaded holes with out any other stability is a recipe for RMR/SRO optic failure.. the slide cut contacts the DPP / R1Pro stabilizes the optic front to rear, and reduces the load on the screws that is why i didn't install the shroud on my R1P as it raised the optic up and reduced contact front and rear with the slide cut out..

SC has a build up... I shave things down to: 1.fit my hand 2. Lower the bore axis 3. Adjust the natural index of my grip to the sight 4. Control the direction and aggressiveness of the stipples in relation to my hands and grip style

Little more time under heat to raise a stipple.. much more agressive bite in the hand than polymer...little harder to sand down and shape before stppiling

I have done 3 so far.

I ran about 8lbs of N340 I had leftover from my limited days..3N37 is to hot melts the gas rings on the plug fairly quickly no presser signs just to much heat at the gas block... CFE Pistol has been my go to latley but out of stock with the panic so moving to sport pistol

Yes the exact thing I was explaining.... as the expansion chamber fills up the time to start piston movement and the unlock/extraction process starts sooner = extraction while the case is still expanded against the chamber = case comes off the extractor/ breach face but doesn't hit the ejector. With 3 MPX's and 60K rounds down range I am convinced this is the key element in MPX reliability issues...

Is the expansion chamber in the gas plug clear? Coated and exposed lead base bullets will fill the expansion chamber in the gas plug causing an over gas issue that results in: early extraction while brass is still expanded in the chamber extractor slips off the case blow back finishes the case extraction but the case never contacts the ejector because it is not on the breach face faster burn rate powders can add to this issue ( pushing gas in to the gas system early in the dwell time at a faster rate / sooner than a slower burn rate would have) in my past experience the expansion chamber in the gas plug clogged with lead/ polymer coating is extremity difficult to clean out even with metal scraping tools. I gave up on one after 3 hours of work and only 20% progress against the lead fouling, I replaced it and threw it in the trash, I only shoot JHP or TMJ now with CFE or Sport pistol and bought a good Ultrasonic tank.

For the MPX barrel length and comp play a big role in bullet weight and powder selection... in my gen 2's (13.7" barrels with MBX comps) I use 115gr JHP's with 5.9 of CFE pistol (1425 fps)... used N340 and 3N37 in the past also..

I didn't bother with Sig over the LCI barrel. Based on my past experience with 1 in 10" 9mm barrels and heaver bullets (147 gr+ ) i just planed for a BarSto barrel (1 in 16") when I bought mine...

First off I want to be clear both UH-1’s were replaced with brand new units by Vortex. However: •Both UH-1’s developed the same left right shifting of the sight body in relation to the mount @ the front of the unit. •This is part of the design function of the windage adjustment in the unit and is spring loaded • My units lost 90% of their spring tension after about 20K rounds fired on each unit (sig MPX’s) and were exhibiting a 6” shot dispersion on a target when shooting controlled pairs at full speed •Re-tightening the QD tension will help for a little bit (30-100 rounds) but it will go back to being loose •The first warranty replacement was seamless Tec stated shifting was bad and unit was defective •Second unit with the exact same problem / symptoms was difficult, Tec instead the shifting was normal and unit was OK, had to argue a bit on why the first unit sent in 1 week prior with the same issues was “Bad” and this one was “Good” •Removed all UH-1’s from my competition and practice MPX’s I don’t trust them •I am monitoring my 2 UH-1’s on AR’s ( one has lost 20% of its tension so far compared to the other) but I simply don’t shoot the volume on them that I do the MPX’s Not bagging on Vortex just sharing my experience. I have moved to Sig Romeo 8T's

Don't agree... as a closed gas system the MPX can be under gased or over gassed by sympley not understanding the burn rate and presser curve of the ammo iregardless of it being reloaded or factory..the stoppages will look the same ( empty case in action, next round not chamberd) this is a fail to eject in an undergassed situation or an extraction failure do to the case still being expanded to the chamber in an over gassed situation.. Factory 115gr can range from 1020 fps to 1490fps in a pcc... lots of info on tuning blowback systems around hear but everyone expects the MPX to run any thing and everything 100% all the time ... I normally run speer 115gr TMJ that is 1400fps with .0520 restricted gas and 13% reduced recoil springs when I go to 115gr JHP @1400fps with 5.9gr of CFE Pistol I have to change to the .114 gas plug( factory Open).. when I use fed 115gr JHP +P+(9BPLE) @1450fps I need to go to a .0469 gas plug with the 13% springs.

If you would put some effort in to tuning the gas in the MPX ( restricted / open plugs) and recoil springs ( +20%, stock, -13%, -25%) to your load you can see additional gains in reduced dot movement...

I don't have a previous gen GG trigger to do any comparisons to. A trigger reach measurements would be irrelevant on my X5 Legion as Idid a under and in cut on my frame before the trigger install. I couldn't live with the vague reset on the lighter trigger return spring so i used the heavier spring , kit took 7/8 of a pound off from my stock 4LB pull BUT I have a good positive reset and a reduction in over travel.