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Product Discontinued by Manufacturer

Phase 5 Weapon Systems Inc WSI Pistol Completion Kit has been discontinued by Phase 5 Weapon Systems Inc and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!

ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for Phase 5 Weapon Systems Inc WSI Pistol Completion Kit

The Phase 5 Pistol Completion Kit is a convenient drop in kit that contains everything you need, except the Lower Receiver, to build an AR-15 pistol. Individually assembled, head spaced, fitted, inspected, and tested, this complete upper assemblies offer the builder a factory-backed, full warranty covered unit you can trust. The assembly includes the Phase 5 LPSN quad rail, chrome lined BCG, lo-pro gas block, gas tube, BL/ CHA and littleBOY Hex Brake. This is a ready to use solution. AR-15 Pistol Buffer Tube Complete Assembly (PBT-CA) by Phase 5 Weapon Systems Inc partners our enhanced buffer spring, billet aluminum Pistol buffer tube, Mil-Spec end plate, Mil-Spec castle nut, Mil-spec carbine buffer and our ultra-durable NPVC-constructed buffer tube foam pad. The lower slot is machined to accept all Mil-Spec end plates and sling mounting accessories. The newly revised Phase 5 Winter Trigger Guard (WTG) is Billet Aluminum and aggressively styled, but creates more space in the trigger area, a useful feature when wearing gloves or when running other components like the Extended Bolt Release V1 or EBRv2. The WTG combines form and function. Lower parts kit includes everything needed to build a complete a lower receiver. All parts are made to standard military specs.image

Specifications for:

Upper Receiver: A3 Forged 7075 T6 aluminum
Barrel: 7.5in, 1
Caliber: 5.56 NATO
BCG: AR15 black phosphate, chrome lined
Quadrail: LPSN7.5
Muzzle Device: littleBOY556
Gas Block: .750 Lo Profile Clamp Style
Gas System: Pistol
Charging Handle: BL/CHA
Buffer Tube Outside diameter: 1.25in

Package Contents:

  • Complete CQC Forged Upper Assembly 7.5in (CQC Complete Upper)
  • Pistol Buffer Tube Complete Assembly (PBT-CA)
  • Phase 5 Winter Trigger Guard (WTG)
  • AR15 Lower Parts Kit (LPK-AR15)

Gun Parts and Accessories

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Gunsmithing Tools & Accessories

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Gun Triggers

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Magazine and Accessories

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Gun Sights

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Gun Stocks

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Mounts, Rings and Accessories

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Related Products to Phase 5 Weapon Systems Inc WSI Pistol Completion Kit

Phase 5 Weapon Systems Inc WSI Pistol Completion Kit Unavailable & Discontinued Models

List of Unorderable Models

  • Phase 5 Weapon Systems Inc WSI Pistol Completion Kit, Black, PCK , MPN: PCK - Pistol Completion Kit , UPC: 813318021427 , Code: 1U8-URC-P5WS216-PCK
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Last updated 2026-09-05 UTC.