Story behind 4.5″ Snub Nose AR Pistol
It’s a long story & you can find video on all the transformations this barrel has gone through to finally find its home.
The barrel started life as a 16″ 5.56 DPMS barrel on my first AR15. When I started my pistol/SBR project I was more into other calibers. I had converted my DPMS AR to 300 blackout & was using the DPMS barrel as a dedicated 22lr.
Then I decided to cut it down to 4.5″ & rethreaded it as a separate upper for my AR pistol. I used the CNC Warrior thread cut die to do it but it was a bitch because the thickness of the barrel was wider than the die. I marked the width I needed & then to an angle grinder to it. Its by far the ugliest thread job I’ve ever don but it’s got good threads & is concentric to the bore.
Then I decided to get the Taccom 17″ dedicated 22lr barrel which basically made the DPMS barrel obsolete. So this barrel just sat & sat & i felt so bad inside.
So about a month or so ago I decided that I was going to repurpose it. My current AR pistol had a 14.5″ barrel & I was going to put it on my clear rifle lower but it had to be pin & welded. I took that to the gunsmith & asked him about the AR gas system. With his info I decided to make my 4.5″ DPMS barrel semi auto instead of single shot.
I used the low profile gas block to measure where I needed to drill the gas port (3/32 drill bit) & used an old carbine gas tube. I cut down the gas tube exactly 1″ from the end of the barrel & had to bend it so it would properly align with the bcg. I also had to file the end of the gas tube to the same size & taper of the original end piece.
I had all the parts except an extra upper receiver & muzzle brake. After the first firing, I realized that I needed to remove access lube from the bcg firing pin & also install a Wolff extra power hammer spring. – 9/16/2014
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Micro AR-15
Muzzle velocity must be 1300 fps.
That’s not a 4.5” that’s a 7”
Holy Keyhole Batman
Building one soon.. have you or anyone in the comment section chrono’d a 4.5” in 5.56 yet?
I am building one in 9 mm, but with a short buffer system
You say its illegal in 2014 yet in 2018 its legal.. Funny how laws change.
Shooting gangster style.
Yay yay
Cool, but completely neutered. Rounds will never stabilize and will never do what they’re intended to do
4.5 is WAY to short for me
why feed your gun that junk ammo? do you not care about this gun? im not trunk to be mean I like the is gun and I'd never use tula with it..
noob click
Happiness is a warm gun ! lol Nice !
Imagine filling out the paperwork and making that an sbr.
the dumbest thing i have started watching in many years.
if you buy more than 3 Ar pistols do you have to pay that 200 stamp for each of them
TRIGGERED!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SO SOSO SOOSOSOSOO TRIGGEREDDDDDD. NEVER SHOULDER, NEVER FORGET.
1:30 STRAIGHT GANGSTA
did you cut the barrel your self ?
Hey you seem to respond to your videos. Do you have any idea where I could get my hands on a 6" upper receiver? I want soooo bad to get my hands on an AR pistol that fires 300 blackouts.
are you having light primer strikes? why so many duds?
why would the hand guard explode on you?
do you have any pictures or video of it without the handguard? have you thought about putting a shorter hand guard on?
So you chop the barrel.off 7 inch.?
I want to do the same ..heeheee nice
4.5 that is crazy bro!
Shouldering arm brace illegal? Do you have a reference that can be verified?
Wow. Awesome little AR pistol. I like it
Gas or recoil operated?
Awesome little pistol.
And I thought 6" was CRAZY! What is the minimum? 2"? Somebody will try it.
Neat little package
Glad it worked out
I never seen a snub nose ar15,lol..suppressed it'll be awsome
Wow that little guy is mean as hell!