The GrovTec US Inc 2.2 Inch 5 Slot Stock AR Black Anodized Picatinny Rail (GTSW189, UPC 811071011891) is a compact MIL-STD-1913 rail section designed for AR-platform stocks and forearms that need a short, rigid accessory mounting point. Precision CNC machined from lightweight aluminum with a Type III black hard anodized finish, it provides five Picatinny slots in a 2.20" footprint for attaching lights, lasers, sling mounts, or other rail-mounted accessories. TLO Outdoors+2GrovTec+2
Model Identification and Core Specs
Common catalog references for this rail section include:
It is part of GrovTec’s Stock AR Picatinny Rail series, intended for conventional AR-15 style forearms or other compatible flat mounting surfaces.
Construction, Material, and Finish
The GTSW189 is built for strength and corrosion resistance while keeping weight to a minimum:
Type III hardcoat anodizing increases surface hardness and provides a durable protective layer suitable for field, range, and duty environments.
Picatinny Interface and Accessory Compatibility
Using a MIL-STD-1913 Picatinny pattern, this section supports a wide range of common accessories:
The five-slot length is optimized for short accessories that don’t require a full-length handguard rail, making it useful on stock polymer forearms, fixed stocks, or other limited-space mounting locations.
Mounting Hardware, Hole Spacing, and “Sandwich” Installation
GrovTec includes hardware tailored for stock-type AR forearms and similar applications:
Included hardware (per GrovTec spec):
Mounting method: “Sandwich” style – the rail sits on the outer surface and the backplates sit inside the handguard or stock, clamping the material between them when tightened. GrovTec+2redriverreloading.com+2
GrovTec publishes specific hole spacing for the GTSW189:
This information helps when marking and drilling mounting holes in synthetic or wooden stocks to ensure proper hardware alignment.
Form Factor, Edges, and Snag Reduction
The rail is designed as a compact, low-snag accessory:
Length: 2.2" with 5 Picatinny slots
Profile: Beveled ends to reduce snagging and eliminate sharp corners and edges redriverreloading.com+1
Approximate weight: Vendor listings for this model family indicate around 1.2–1.3 oz packaged weight. AR15Discounts
Beveled ends and a compact footprint help prevent the rail from catching on gear, slings, or vegetation, which is particularly useful on hunting and patrol rifles.
AR Platform Application
This model is generally listed as suitable for AR-15 / AR-platform rifles:
Typical mounting locations include:
Stock polymer AR forearms that lack integral Picatinny sections
Fixed or adjustable stocks where a short rail is desired for sling hardware or accessories
Other compatible flat surfaces on rifle furniture, provided the material thickness and curvature allow secure “sandwich” mounting
Because it uses Picatinny, it is not specific to one accessory brand or function; instead it provides a standardized mounting base.
Use Case Scenarios
Common applications for the GTSW189 2.2" Stock AR rail include:
Adding a small weapon light mounting point on a basic AR handguard
Providing a QD sling adapter or other sling hardware base (through a separate rail-mounted QD socket)
Mounting compact grips or handstops in a specific location without changing the entire forearm
Creating a modular attachment point on a hunting or patrol rifle where minimal added bulk is desired huntcampfishsuppliesonline.com+3Palmetto State Armory+3Trigger Banger+3
Because it is short and lightweight, this rail section is often chosen when only one or two small accessories need to be added to an otherwise uncluttered rifle.
Technical Specifications (Summary)
GrovTec US Inc 2.2 Inch 5 Slot Stock AR Picatinny Rail – GTSW189
Brand: GrovTec US Inc
Series: Stock AR Picatinny Rail
Model / MPN: GTSW189
UPC: 811071011891 TLO Outdoors+2Hinterland Outfitters+2
Rail standard: MIL-STD-1913 (Picatinny / M1913)
Length: 2.20"
Slots: 5 Picatinny slots TLO Outdoors+2AR15Discounts+2
Material: CNC-machined solid aluminum
Finish: Type III black hard anodized / black anodized Palmetto State Armory+2TLO Outdoors+2
Firearm type: AR platform (AR-15), “Stock AR” mounting
Hole spacing: Min 1.20" – Max 1.50" (center-to-center) GrovTec
Included hardware: 2 × 10-32 × 0.375" hex-head screws, 2 × washers, 2 × flat threaded backplates, Allen key GrovTec+2Palmetto State Armory+2
Features: Beveled ends for snag reduction, solid aluminum construction, compact 2.2" footprint
By combining a 2.2" five-slot MIL-STD-1913 interface, precision CNC-machined aluminum construction, Type III black hard anodized finish, beveled low-snag ends, and complete mounting hardware, the GrovTec US Inc 2.2 Inch 5 Slot Stock AR Black Anodized Picatinny Rail GTSW189 (UPC 811071011891) provides a compact, technical solution for adding a standardized accessory mounting point to AR-platform stocks and forearms.
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