RMW Extreme Build. It has begun.

[Pablo]

Not a huge deal. Ron is fully supporting me. I'm just waiting until I can fire it as a rifle. So we wait. On ATF.

All but one of the magazines seems to just right now. One needs the feedlips brought in just a couple thousandths.

[Pablo]

Well I got my NFA Tax stamp and have a 10mm SBR.

[sstewart]

Well well ....
How does it shoot?

[Pablo]

Well well ....
How does it shoot?

Can't make it to the range today......and for that matter maybe not until Friday. Ugg...........

[sstewart]

Yeah it's raining here. Indoor ranges are crowded on weekends.

[Pablo]

Well well ....
How does it shoot?

It shoots like a dream. What a road trip to get to this point!!!

First the (sorta) bad: I need to fine tune 3 of my 4 Grease Gun magazines. Oh so close. One must learn these magazines. These three had the odd feed issue because the feed lips are just a hair too wide.

The good: The single dialed in magazine allowed the gun to run line a dream. I was actually stunned and relieved at the same time. Oh man, rapid fire HOT 10mm from a 11" barrel? WOW. The gun with the MFT Minimalist Stock and RVG is a super comfortable and shoots very tight groups. It's pretty light so 220 grain bullets push pretty good - I had one or two misfeeds with these bullets, but my Glock doesn't like those largr bullets either. I had zero issues with 155gr and 180 gr. It even shot plinking rounds (I was worried that it could ONLY use hot ammo).

So as for the main cause? In the heat of fighting the thing, I think it was too many variables screwing up at the same time for me to nail down. All I learned so far can be summed up: AR Pistols absolutely SUCK. 10mm very short gas tube AR pistols WILL short stroke like fat guys at a pork chop convention if not shouldered firmly. Once I got the the thing shouldered with a rifle tube, proper spring, the bolt cleaned up and a good mag dialed in, all my worries were GONE. I even shot it like a pistol again, yep misfired the same as before.

Now I can't wait to shoot it some more. What have I created???

[sstewart]

That's awesome that you have sorted out the mag issues.
Don't quite get the short stroke thing. 
Haven't experienced that with my 300 blk ar pistol with 12.5 barrel.

[Pablo]

That's awesome that you have sorted out the mag issues.
Don't quite get the short stroke thing. 
Haven't experienced that with my 300 blk ar pistol with 12.5 barrel.

How long is your gas tube? (serious question)

How strong is your right wrist? 

Gun was catching me limp wristed with that stupid Sig brace even, just never was comfortable shoot the beast as a pistol. Never limp wristed a pistol before, but somehow this combination does it with routine precision as confirmed yesterday.

[sstewart]

Probably pistol length. I bought the upper and built everything else. Is yours carbine length?
Still want one of these. 10mm is so much cheaper to reload than 308 or 300 blk.

[10mmfan]

I had an ar pistol in 5.56 with a 7.5" barrel it ran perfect but looked like a flamethrower

[Pablo]

Probably pistol length. I bought the upper and built everything else. Is yours carbine length?
Still want one of these. 10mm is so much cheaper to reload than 308 or 300 blk.

Pistol length gas tube is what 6.75"? Mine is just inches long. Like 2" or so. I readily concede it could be me 100% limp wristing. I tried one handed, with and without the brace, two handed,etc. As soon as I went to rifle stock, problem ended. Try pistol hold, starts again.

10mm is a hoot and well worth it.

[Pablo]

I had an ar pistol in 5.56 with a 7.5" barrel it ran perfect but looked like a flamethrower

No flame out of an 11" barrel 10mm!!

People 100% report no issues with pistol AR's and rifle rounds. I searched the web and no limp wristing stories (only Glock 9mm pistols!!). All I know it happened to me. And  as I stated never had any limp wristed problem shooting any other pistol.

[Pablo]

Wow the more I fire this thing the more in love I am!!! The cool thing is that it fires plinking light ammo - the reason this is cool is because when Ron and I were working through the issues he kept telling me I needed
super hot ammo to make the gun run and I sort of resigned myself to that. But I can put all kinds of rounds in the magazine and the gun doesn't seem to hiccup. It just want to be a rifle, it's all that it asks. Just a complete hoot to shoot.

[mrpipesmkr]

  Hola, Pablo,
  Thought you might enjoy reading about my RMW Xtreme 9x25 build.


I finally bit the bullet and with the help 0f Ron Williams of RMW Xtreme built an AR in a caliber I have long felt would make an excellent carbine.  I am attaching pictures of my latest AR chambered in 9x25 Dillon. Ron supplied the upper and I built a Large Glock Quarter Circle 10 lower for the project.
   I have to say that Ron has really made the difference in developing this piece for me and making it run. He is the "go to guy" for D.I. pistol caliber uppers for the AR!  Not only did he locate a 9x25 Dillon ream to use, he designed the gas system to function at the 9x25 pressures. Getting the 9x25 ream was important for me as I wanted a carbine that would have common magazines and ammunition with my G20.  As is to be expected with a project like this there was some "dialing in" to do with the gun initially?   I at first had some failure to feeds and jams, about 6-7 out of the first 50 rounds.  Ron spent a lot of time with me on the phone helping to diagnose the problem and explaining how to fix it.  I just followed his instructions and reported results back to him until the gun was running fine.  Most of the problems had to do with differences between my lower and the one he had used to test the upper with.   Ron is so knowledgeable about AR's he was able to take the info I gave him and explain to me what was going on!   He is a genius when it comes to this stuff!
   The debate I had with myself over the last couple of years was which would make the better carbine, 10mm or 9x25.  While the 10mm is probably the more practical round due to ammo availability I felt the 9x25 offered some advantages over the 10 in an AR platform. The 9x25 and the 10 both develop about the same energy at the muzzle with case capacity being nearly the same. But the smaller bore size of the 9 means better gas availability to operate the Direct Impingement system as well as higher velocity at the muzzle. This, along with the better bullet B.C. of the 9 means a flatter shooting piece able to reach out a little further than the 10mm. I anticipate an effective range in excess of 300 meters with good hitting power at that distance.  In addition, I followed Ron's advice and had him install an adjustable gas block on the gas system.  This has allowed me to dial down the gas to control recoil.  That makes for a very nice soft shooting piece that is easy to keep on target.
  As you can see from the pics, I have kept my 9x25 AR pretty basic. My thought on a pistol caliber carbine is to build as light as possible for better portability and maneuverability. I have attached a tactical scope, which my old eyes almost require lately, and I intend to mount a Magpul BUIS folding rear sight. It's a medium barrel with a 35 caliber hole drilled through it, which makes the barrel fairly light. I have not weighed the piece but believe it comes in just under 7 pounds. Recoil is adjustable with the adjustable gas block so the lighter weight feels good when firing the weapon.   .
So far, I have to say I have been very happy with my decision!  The Dillon is very fast out of a 16 inch barrel and just judging by the way it smacks around various targets at 60 meters I have to say I'm impressed.  This thing will toss a 1 gallon milk jug full of water 12 to 15 feet in the air and about the same distance to the rear!
  I am still working up loads for the AR that will be usable in my G20 as well as the AR but my base load so far has been 10.6 grs. Of Longshot behind a 125 grain bullet.  I do not own a chronograph so I don't have exact velocity figures but I believe that load is producing in excess of 2200 FPS out of the longer barrel.
  This higher velocity has produced a problem of its own though as none of the bullets I have used so far stands up to the higher velocity. I have used ZERO, Hornady HAP's and sierra with the same results. Upon contact with a water jug these bullets immediately disintegrate into BB sized fragments.
  Gold dots seem to do a little better and hold up well enough that you can see they penetrate both sides of the jug.  I also have plans to load 125 gr. X-TAC by Barnes and 125 grain Montana Gold 357 Sig.  The MG has a brass jacket and a harder alloy core that may hold up well to the higher velocity. As time goes by I intend to try other options such as 357 magnum bullets sized to .355.  Should be fun!
  If you are a fan of the 9x25 I would suggest contacting Ron and looking into building a carbine to match your pistol. This little round has more than enough power and velocity to make a great intermediate rifle. So far, my experiment has gone well and working to dial in the piece and come up with loads for it has proven to be more fun than I have had on the range in quite a while!


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[Pablo]

Wow.  Hot dog!  9x25 AR is definitely on the list. Ron has been getting plenty of mention. A couple issues back Shotgun News did a 9x21 AR from RMW. SEEMS to me a 9x25 would feed better than a 10mm. I  still wrestle with the GG magazines