Yankee Hill Machine MODEL–S7 AR-15 Pistol 5.56 NATO with Maxim Defense PDX 5.5 in Upper, PDW Brace, Radian Raptor-LT
This custom AR-15 pistol pairs a Yankee Hill Machine MODEL–S7 lower with a Maxim Defense PDX 5.56 upper featuring a 5.5 inch barrel. It is set up with a Maxim PDW-style collapsible brace, a free-float M-LOK handguard with an integral handstop, and a Radian Raptor-LT ambidextrous charging handle. Built on 7075-T6 aluminum receivers with a Type III hard-coat anodized finish, it offers a compact 5.56 NATO configuration with quality components throughout.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from previous handling and use.
What’s Included
- Yankee Hill Machine MODEL–S7 5.56mm NATO AR pistol as described
- 1x Magpul PMAG Gen M2 30-round AR/M4 magazine (polymer), sealed in packaging
Built on a YHM MODEL–S7 lower receiver, this pistol uses a Maxim Defense PDX 5.56 upper receiver group with a 5.5 inch barrel and direct impingement operation. It is chambered in 5.56mm NATO with a 30+1 capacity and accepts STANAG pattern magazines. A manual safety selector is present.
Controls and ergonomics are upgraded with a Radian Raptor-LT ambidextrous charging handle, a flat/straight trigger shoe, and a K2-style polymer pistol grip. Selector markings are FIRE/SAFE, and the lower is marked with the YHM diamond logo, EASTHAMPTON, MA, U.S.A., CAL MULTI, and MODEL–S7. The upper is marked 5.56x45.
The free-float aluminum M-LOK handguard provides M-LOK slots at 3, 6, and 9 o’clock, a continuous 12 o’clock Picatinny rail, and an integral forward handstop. Both receivers are 7075-T6 aluminum with a Type III hard-coat anodized finish. The upper includes a forward assist, and an ejection port cover is present.
A Maxim PDW-type collapsible arm brace rides on dual guide rods and includes a rear strap. The threaded barrel is fitted with a compact multi-chamber muzzle brake/compensator featuring lateral and top ports. Handguard and brace housing bear Maxim Defense markings.
Country of origin is the USA, and the build references mfg part number MXM-477813 for the Maxim Defense component.