Superlative Arms .625 Set Screw DI Builders Kit, Mid-Length

The Superlative Arms Mid-Length Direct Impingement (DI) Builder’s Kit is a purpose-built, core operating system designed to increase the reliability and overall user experience of your AR15.  This kit includes a Sup Arms adjustable gas block with their patented Bleed Off mode and Exterior Locking Detent, along with a pre-installed 304 Stainless Steel gas tube. Additionally, it comes with a Sup Arms DI Bolt Carrier finished with Diamond-Like Carbon (DLC) that’s compatible with all AR-15 bolts.

The Sup Arms DI Bolt Carrier is crafted from 8620 steel and features a mil-spec chrome-lined bore with enhanced machining and a superior DLC finish. This results in better lubrication, reduced friction, and easier cleaning than traditional phosphate or black nitride finishes. The DLC Gas Key is securely fastened with Optimized Carrier Key Screws (OCKS) by Ned Christiansen, ensuring excellent staking and screw retention.

The Sup Arms adjustable gas block manages gas flow differently than regular gas blocks. Instead of restricting the gas, it allows excess gas to bleed out of the front of the block. The outcome is a smoother shooting experience with less recoil. Moreover, this gas block is highly adjustable, allowing you to finely tune your rifle’s operation to your liking.

*Don’t Forget your Bolt Kit!

DI Builder’s kits come standard without a bolt kit (Bolt, Cam Pin, Firing Pin, Firing Pin Retainer).  You can use your pre-existing AR15 bolt with this kit or purchase one of our Toolcraft AR15 Bolt Kits offered in almost every configuration here Toolcraft AR15 Bolt Kits.

Includes

• Sup Arms DI Bolt Carrier & Key
• Sup Arms Adjustable Gas Block, .625″, Set Screw Mount, Black
• Gas Tube, Mid-Length, Stainless, QPQ Melonite (installed)

Achievements

• The pressure used in the block is reduced only to the amount required to drive the bolt carrier. The remaining gas and pressure are bled out of the block, allowing the system to run much cleaner and cooler.
• Reduction of wear on the bolt carrier group components and upper receiver.
• Reduction of felt recoil, allowing for faster follow-up shots.
• The patented adjustment detent is located outside of the block, and therefore, there is no contamination.
• In Bleed Off Mode, the gas adjustment screw does not restrict the gas flow; therefore, there is no erosion or seizing of the screw and no loss of detent due to carbon build-up. Although it is removable, we have added a safety mechanism that stops you from unintentionally backing the screw all the way out.
• When using SBRs and suppressors, the Bleed Off port allows the excessive pressure to be exhausted out of the block, reducing blowback.

Note: The DLC color, tint, and tone will vary from lot to lot and can and will be slightly different than photos.

***Please note that this kit is currently for the AR-15 platform only. ***