This latest trend for PCCs has been fuelled by an explosion in the AR-9 pistol market, preppers and simple range shooting enthusiasts that like the cheap ammo. But what are the best 9mm rifles on the market? What's the difference in length? I shot a KRISS VECTOR yesterday! Damn It now I want one.Pistol Caliber Carbines are a seriously big market these days as the world turns on to small caliber rifles. I just ordered the new shorter three lug adapter from silencerco. Multiple charging handle options, aftermarket rails(which swap in seconds), more trigger options, aftermarket barrels(since sig sucks and hasn't supplied them like they should), etc. Now the MPX is really coming into its own. For what it is worth I've had the same issues with some ammo on my mac 10 and on full auto gassy ammo sucks. I haven't messed with the gas system on it, since it runs everything I don't want to mess with it. I will say I've found that some ammo is really gassy while other isn't. Running an octane 9(now with the shorter 3lug vs that picture), trijicon mro, bcm front grip, etc. I have the next level armament charging handle since that was the first with the lifter to stop the handle from scraping the back of the gun(a problem sig should fix). They had the idea to leave the top rail black which I think worked well. He then refinished the gun in the burnt bronze and filled in some of the engraving(I didn't want it all filled in with black). Had TSC machine cut the barrel to 5 inches and install a 3lug over it. I went a little overboard on my gen 2 sig past that. Larue said on TOS he would warranty them early on) to get rid of the guns biggest issue which was the crap trigger. It is cheap, I'll give it that but I'd rather spend a bit extra and get something I think it nicer. I've only played with the scorpion and wasn't impressed. I've shot 9mm ar's before as well as mp5's, the beretta cx4, and a few others. You can shoot steel closer, ammo is a bit cheaper, etc. I still find the only really use of a 9mm rifle is for fun, or for shooting PCC division in USPSA, or as a training gun that you can use on occasion instead of a real rifle. I can't remember the make/model, but it wasn't very expensive and took all of 1-2 minutes to install. One aftermarket part my friend said was almost required when suppressing the MPX was a new gas insert that eliminated gas to the face. TL DR: After building and buying a few 9mm ARs, if I had to do it again I would probably just buy the MPX and be done with it. Plus I am seeing MPX mags coming down in price, as well as the availability of aftermarket triggers/charging handles/etc. I think the MPX is a pretty great option if you are looking for a 9mm rifle, and after you buy the higher-quality parts to put a 9mm AR together, the cost isn't as different as you might think. My 8.5" with my Omega 9k is not as quiet, but will comfortable to shoot indoors without ears. We shot that last weekend after a USPSA match with the Fiocci 158 grain subs and it was incredibly quiet. I also have a friend with an SBR'ed MPX with the Sandman Wolf suppressor. I then did a QC10 colt lower, JP bolt, Colt SMG upper, and Faxon barrel. I am using a Vltor A5H4 buffer with an A2 spring in a carbine tube and it is about the perfect length for engaging the bolt catch without battering it unnecessarily. I then build a QC10 gun (QC upper, bolt, barrel, and lower) that runs like a champ, no issues at all. I had a load of problems with a palmetto 9mm AR (surprise!), and got rid of that after sending it back to them and still having the same problems. I initially went with the glock lower, but have since changed to a QC10 colt lower. I also see quite a few of them at the local USPSA matches. For a buffer I am running the Spikes Tactical ST-9X 9mm Stainless Steel Buffer and a Wolff extra power spring. I added a HK tri lug for QD with my Tirant9 and it is a wickedly quiet pistol or SBR depending on what lower its on. Put it together with a cheap Rainier slick side upper and an ebay rail - It runs like a top. Went with a CMMG 9mm BCG as you can use it with a normal AR trigger & hammer. For a barrel I went with a Ballistic Advantage Modern Series 5.5" 9MM Barrel because it was cheap and the right length for my needs. I went with a Hahn Bottom 9mm Adapter so I could swap it between an SBR lower and a pistol lower. If you do research you will end up with a solid upper. I still have a bad taste in my mouth from a SIG556. The main down side to the MPX, for me, is that it's made by Sig. I'm a little concerned about function issues with a roll your own 9mm AR. I keep on going back and forth between a MPX and a Colt pattern 9mm AR. I want a 9mm rifle, with controls similar to an AR15, to shoot steel.
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