Description AIM7 ARCHER AA-12 WLN & Barrel Adapter Linear Comp 1/2×28 for 9MM & AR9 “WILL NOT FUNCTION ON DELAYED BLOWBACK PISTOLS” Delayed Blowback: The Key Difference Delayed blowback systems include a mechanism that slows the slide/bolt’s rearward movement, giving time for the chamber pressure to drop to safe levels. This allows for: Use of higher-powered cartridges (like 9mm or even .45 ACP) Reduced felt recoil More reliable extraction and ejection Aim7 Welin-Lock Rear Mount 1.125×28 (1 1/8×28) SUS303 STEEL Aim7 Welin-Lock Rear Mount screws into the rear of the suppressor tube to allow for attachment via Welin-Lock. To mount your suppressor using Welin-Lock, you will need this Welin-Lock Rear Mount as well as a Welin-Lock barrel adapter (sold separately). Features SUS303 Stainless Steel Compatible with Welin-Lock barrel adapters Cosmetic geometry for a firm grip Inside taper locks rear mount onto the barrel adapter Overall 1.193″ SUS303 (AISI 303 / EN 1.4305) Stainless Steel — Hardness Material Type: Austenitic stainless steel, free-machining grade (higher sulfur content for better machinability). Typical Hardness (Annealed / Solution Annealed condition): ~160–190 HB (Brinell Hardness) Equivalent to about 85 HRB (Rockwell B scale). After Cold Working / Work Hardening: Can reach ~200–240 HB (approx. 95 HRB). Heat Treatment: Not hardenable by heat treatment (like most austenitic stainless steels). Only strengthened by cold working. Aim7 Welin-Lock Universal QD Barrel Adapter 1/2×28 (9mm Only) The Welin-Lock® system is a universal quick-detach (QD) piston interface developed by Aim7. It allows users to rapidly attach and remove suppressors using a standardized QD barrel adapter and piston setup—ideal for situations where speed and reliability are critical. Key Features 3 mounting positions spaced 120° apart for fast and secure installation Forward taper that helps reduce suppressor baffle strikes Coarse, top-cut threads for improved durability and ease of maintenance Made from 17-4 stainless steel with a QPQ nitride finish for enhanced wear resistance Installs using a ¾″ (19 mm) socket, tightened to ~20 ft-lbs Thread Pitch Options The Welin-Lock barrel adapters are available in various thread pitch options to match different firearm barrels, including: ½×28 (standard) Summary Table Feature Details Mount Type Quick-Detach (QD) Welin-Lock™ Adapter Material & Finish SUS303 COATED Wrench Size & Torque ¾″ socket (19 mm), ~20 ft-lbs Mounting Interface 3 positions, 120° apart Forward Taper Locks piston, reduces baffle strikes Thread Pitch Options ½×28,
