Radical Firearms RF-15 5.56 NATO AR Pistol, 7.5 in Barrel, Custom Build with American Tactical Omni Upper, Free-Float M-LOK, SB Tactical Brace
This custom AR pistol pairs a Radical Firearms RF-15 lower receiver with an American Tactical Omni upper receiver for a compact 5.56 NATO setup built around a 7.5 inch barrel. It features a free-float M-LOK aluminum handguard with a continuous T-marked Picatinny top rail, a threaded muzzle with a birdcage flash hider, and an SB Tactical adjustable arm brace. Direct impingement operation, a manual safety selector, and forward assist/ejection port cover complete the core configuration. One 30-round Magpul PMAG is included.
The lower is marked RADICAL FIREARMS RF-15 with the RF logo and MULTI caliber, while the upper is marked AMERICAN TACTICAL with US Patent 9068786. The pistol configuration uses a receiver extension with castle nut and end plate and no shoulder stock. A low-profile set-screw gas block keeps the profile streamlined, and the Mission First Tactical (MFT) polymer pistol grip provides a solid hold.
The aluminum free-float handguard supports modern accessory mounting via M-LOK slots, while the T-marked top rail offers consistent indexing across the upper and handguard. The SB Tactical brace includes an adjustable strap and QD sling socket for carry flexibility. Standard AR controls are present, including a manual safety selector and a standard magazine release.
This RF-15 pistol is chambered in 5.56mm NATO with a capacity of 30+1 and comes with a Magpul PMAG polymer STANAG-pattern magazine for 5.56x45. It retains key reliability features such as a brass deflector, ejection port cover, and forward assist.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: This firearm is in solid shape. It has various cosmetic imperfections, scratches, blemishes, and areas of finish loss.
What’s Included
- Radical Firearms RF-15 5.56 NATO AR pistol (custom configuration as described)
- One 30-round Magpul PMAG polymer STANAG-pattern magazine for 5.56x45
The 7.5 inch barrel is threaded and fitted with a birdcage flash hider, with a low-profile set-screw gas block tucked under the free-float handguard. The direct impingement system follows the AR-15 platform standard, and the brace-equipped pistol configuration keeps the overall package compact.
The SB Tactical adjustable arm brace features a QD sling socket and velcro strap, adding carry options without changing the pistol classification. The Mission First Tactical polymer pistol grip complements the setup with a durable, ergonomic hold.
Receivers are a highlight on this build: the Radical RF-15 lower is clearly marked with the RF logo and MULTI caliber, while the American Tactical Omni upper includes its distinctive patent marking. Standard AR controls and features—manual safety selector, standard magazine release, forward assist, ejection port cover, and brass deflector—are all present.