10.5″ M-lok Pistol Kit
Original price was: $459.00.$309.95Current price is: $309.95.
10.5″ 5.56 AR-15 pistol kit with a Black free-float M-Lok handguard and chrome moly Nitride barrel. Lower Parts Kit and buffer tube included; no lower receiver.
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The DT10-171 pairs a 10.5″ chrome moly, Nitride-finished 5.56 barrel with a slim, free-float Black M-Lok handguard for a longer-sighted AR-15 pistol build. This upper-only kit does not include an 80% lower receiver.
- Caliber – 5.56 NATO (.223/5.56)
- Barrel – 10.5″ Chrome Moly, Nitride finish
- Twist Rate – 1:7
- Gas System – Carbine-length
- Muzzle Thread – 1/2″-28
- Handguard – 10″ Black M-Lok, free float
- BCG – Nitride-coated, mil-spec
- Lower Receiver – Not included
What’s Included: a complete barreled upper — chrome moly Nitride barrel, mil-spec BCG and charging handle, free-float M-Lok handguard, gas block and tube. It also includes a mil-spec Lower Parts Kit and a US-made pistol buffer tube with buffer and spring. It does not include a lower receiver, pistol brace, or magazine.
Browse our full lineup of AR-15 .223/556 Pistol Build Kits, or pair this upper with one of our Black 80% lower receiver to finish your build.
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 | M-lok |
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Q: Does this kit include a lower receiver?
A: No — the DT10-171 is an upper-only kit; you’ll need to supply your own AR-15 lower (stripped, complete, or 80%) to finish the build.
Q: What caliber is this kit chambered in?
A: 5.56 NATO (.223/5.56) is the caliber for the DT10-171, run through a 1:7 twist 10.5″ barrel, threaded 1/2″-28. Note the BCG is machined specifically for 5.56 NATO, not interchangeable across calibers.
Q: Does the twist rate matter for the ammo I run?
A: Yes — the DT10-171’s 1:7 twist stabilizes heavier 5.56/.223 bullet weights (62–77gr) particularly well, in addition to standard 55gr loads.
Q: What handguard is installed, and does it free-float the barrel?
A: The DT10-171 uses a 10″ Black M-Lok handguard, free-floated off the barrel for consistent accuracy and zero retention under sustained fire.
Q: What gas system does the 10.5″ barrel use?
A: Carbine-length gas system. On the DT10-171’s 10.5″ barrel, that length keeps the action running reliably without over- or under-gassing.
Q: Can this be built as a rifle instead of a pistol?
A: At 10.5″, the DT10-171’s barrel falls well short of the 16″ rifle-length minimum. Building it with a shouldered stock rather than a brace reclassifies it as an SBR under the NFA — that requires ATF Form 1 approval and a tax stamp before you assemble it that way.
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