**Fits Gen2 DPMS short frame gunsWe start off using a high precision match blank in 1:8 twist, machine it to the highest quality and matched with our limited-life time warranty. You have a barrel that is the best value hands down in the industry. We are so confident in our Match barrels that we will offer a 100% money back guarantee within 90 days of purchase. If you aren't completely satisfied with the barrel for any reason, return it for a full refund, no questions asked.Features:

Stainless Steel Match Grade Blank
Length: 18"
Twist: 1:8
Gas Block Seat: .800 Diameter
Thread Pitch: 5/8X24
Weight: 2 lbs 6.8 oz
6.5 Creedmoor Match Chamber
Rifle Gas System
Enhanced Feed Ramps
Proprietary Contour
Bead Blasted Finish

 
Rainier Arms Low Profile Gas Block:

416 SS
Finish: Melonite
Ultra Low Profile.
Weight 1.7 oz
Made in the USA

 
Adjustable Gas Block:
Bleed Off”, direct impingement, gas block for the AR15 platform adjusts the gas flow by bleeding the gas out of the block instead of restricting the flow like conventional adjustable blocks.  Results:

The pressure used in the block is reduced only to the amount required to drive the bolt carrier. The remaining gas / pressure are bled out of the block allowing the system to run much cleaner and cooler. 
Reduction of felt recoil.
Patent pending adjustment detent is located outside of the block and therefore no contamination.
The gas adjustment screw does not restrict the gas flow; therefore there is no erosion or seizing of the screw / no loss of detent due to carbon build up.  Although it is removable, we have added a safety mechanism, which stops you from unintentionally backing the screw all the way out.
When using SBR’s and / or suppressors the bleed off port allows the excessive pressure to be exhausted out of the block reducing blow back. 

 
Spec:

Gas Block Material: 416 SS
Finish: Melonite or Matt Stainless
Barrel Diameter:0.625" -0.875"-0.750" - 0.936"
Weight:  1.80 oz
Length: 1.00"
Attachment Type: Solid
Gas Adjustment:  (Patent Pending) 30 Locked Positions, Front Of Block 
Bleed Off Port:  (Patent Pending) Front Of Block

Included:

Gas Block - Assembled
(2) 10-32 x 3/16" Socket Head Cap Screws
(1) Gas Tube Roll Pins
(1) 3/32 X 6" L-Shaped Hex Keys