10.5″ Sig Brace 300 AAC Blackout Pistol Kit Upper Assembled with 80% Lower
Original price was: $1,099.00.$669.95Current price is: $669.95.
10.5″ .300 Blackout AR-15 pistol kit in Flat Dark Earth with 7″ keymod, free float. Includes BCG, charging handle, LPK, buffer tube, and an 80% stripped lower receiver.
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The DT10-001 is a complete 10.5″ heavy chrome moly, phosphate finish .300 Blackout pistol build kit finished in Flat Dark Earth, bundled with an 80% stripped lower receiver — everything needed to build a pistol from the ground up.
- Caliber – .300 AAC Blackout
- Barrel – 10.5″ Heavy Chrome Moly, phosphate finish
- Twist Rate – 1:8
- Gas System – Pistol-length
- Muzzle Device – A2 Flash Hider, 5/8″-24
- Handguard – 7″ Keymod, free float
- Upper Receiver – M4 flat-top
- Finish – Flat Dark Earth
- Lower Receiver – 80% stripped lower receiver included
What’s Included: a complete M4 flat-top upper — chrome moly barrel, mil-spec .300 BLK-specific BCG and charging handle, 7″ keymod, free float handguard, gas block and tube — plus a mil-spec Lower Parts Kit, a US-made pistol buffer tube (Sig Brace-compatible) with buffer and spring, and an 80% stripped lower receiver. It does not include a magazine, jig/tooling, or sights.
This complete Pistol Kit is not an FFL item because the lower is not complete — it is machined 80% and still needs machining to finish. Pair it with our 80% lower jig kit, or browse our full lineup of AR-15 300 Blackout Pistol Build Kits.
WE DO NOT SHIP 80% LOWER RECEIVERS TO THE FOLLOWING STATES – NY, RI, NJ, CT, MD, DE, HI, IL, NV, CA, WA, DISTRICT OF COLUMBIA, DENVER, CO OR BOULDER, CO
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: www.P65Warnings.ca.gov
| Weight | 7.2 lbs |
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| Accessory Attachment Style | Keymod |
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Q: Does this kit include a lower receiver?
A: Yes — the DT10-001 includes an 80% stripped lower receiver, which still requires machining (jig and tooling sold separately) before it’s a complete, legal lower.
Q: What caliber is this kit chambered in?
A: The DT10-001 is chambered in 300 AAC Blackout, with a 1:8 twist 10.5″ barrel, topped with an A2 Flash Hider, 5/8″-24. Because 300 AAC Blackout uses a caliber-specific BCG, it isn’t interchangeable with a different caliber’s bolt carrier.
Q: Can I run this suppressed?
A: Yes, and the DT10-001 is a good candidate for it: 10.5″ .300 Blackout barrels are a favorite for subsonic, suppressed shooting. You’ll need your own NFA tax stamp and suppressor.
Q: Is the Flat Dark Earth finish just on the handguard, or the whole kit?
A: On the DT10-001, the Flat Dark Earth finish covers the handguard and receiver-facing components of the upper; the barrel itself retains its natural chrome moly finish.
Q: What gas system does the 10.5″ barrel use?
A: A pistol-length gas system, sized specifically for the DT10-001’s 10.5″ barrel to keep the action cycling reliably.
Q: Can this be built as a rifle instead of a pistol?
A: Only with a lower and stock combination that complies with current ATF rules. The DT10-001’s 10.5″ barrel is below the 16″ rifle-length minimum, so pairing it with a shouldered stock instead of a brace makes it an SBR under the NFA, requiring registration and a tax stamp first.
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