MasterPiece Arms is releasing a new SBR: the MPA570SST-SBR. The 570SST-SBR will be chambered in 5.72 x 28, have adjustable front and rear sights, side-cocking charging handle, muzzle brake, MPA’s own short aluminum quadrail, a low profile folding buttstock and the Strike Industries Foregrip. The Barrel will be 10″ threaded, featuring 1/2″ x 28 threads so it will be ‘can-ready’.  The MPA 570SST-SBR is based on their MPA57SST 5.72 x 28 MM pistol.

The new MPA SBR, stock folded.

About the stock:

The MPA stock works with 930, 30, 10 or 57 series pistol receivers. It secures to the frame w/ ¼-20 threaded hole behind grip on the lower section receiver. Features a lock nut to hold the screw in place on the inside of the receiver below the sear plate.

Side Cocker, Scope Mount
one (1) 8″ Threaded Barrel
one (1) 20 Round Polymer Magazine
one (1) Muzzle Brake
Thread Size 1/2 x 28
American Made
Ships in Gun Case
Lifetime Guarantee
Strike Industries Foregrip
MPA Short Aluminum Quadrail
Adjustable Front Sight
Chamber 5.7x28mm
MPA Low Profile Buttstock
MPA Side Folding Attachment
MPA Suppressor Not Included

{ 7 comments… read them below or add one }

Lance October 22, 2012 at 11:59 am

Another MAC-10 and no HK MP-7 4.6 caliber …… yawn.

I like to see MP-5 chambered in 4.6mm or 5.7mm or better yet 9×19 worked well for decades. Wish we could get the Russian AP 9x19mm round for PDWs.


crackedlenses October 22, 2012 at 12:42 pm

What the MP-7 should have been; this could be interesting……


Mike October 22, 2012 at 2:22 pm

I picked up a MasterPiece Arms 5-7 this weekend and handed it right back to the gun store employee when I felt how HEAVY it was.


Axel October 22, 2012 at 5:12 pm

In my opinion, nothing beats the P90.


Josh October 22, 2012 at 5:46 pm

The P90 has a damn fine weapon, but I believe the MP7 is superior.


Lance October 22, 2012 at 6:07 pm

I agree all elite US units that have used a SMG use now a MP-5 and MP-7 once in a while a M-3.


Charles C Passmore October 22, 2012 at 6:31 pm

A full auto GLOCK with a suppresser is a much better choice if you want to jump through the ATF hoops to get it. But a 9mm doesnt getit


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