U45 Spare and Replacement Parts

Adjustable Bolt System Mainspring

This is the standard mainspring used for all adjustable bolt system configurations (9mm, 45ACP, & 7.62 x 25).  It is specially designed for maximum reliability across a wide variety of cartridge characteristics.    Used in: STG...

STG Universal Extractor with Spring and Pin

Standard AR- M16 Extractor with small flat machined to work in all Univerals configurations: U9, 34k, Stemple-Suomi, STG 76, U9SF, U45, U762, and post-2020 STG 1928s   Includes extra power Wolff spring and mounting pin

Heavy Bolt System - Bolt Extension Conversion for CAR to A2

STG Universal 9mm/7.62x25 Bolt Extension Conversion for using the CAR Bolt Extension with A2 length stock.     Can be used with STG Universal (STG-U) & STG 43 with A2 length stock. 

KP31 Barrel Spacer For Use on Stemple STG Setups: .396" thick

STG Universal Barrel Bushing: fits between barrel and shroud for creating a tight barrel fit on the trunnion lugs.  This is only necessary for using original Swedish and Finnish barrel shrouds on Stemple Takedown Gun (STG) setups.  Given the...

Adjustable Bolt System - Bolt Guide

STG Universal Bolt Guide for all setups utilizing the Adjustable Bolt System (9mm, 7.62x25 and 45 acp). Ejector Included   Reference Chart Below

Picatinny Rail Top for Stemple Receiver

Picatinny Rail Top for Stemple Receiver with mount screws

KP31 Barrel Shim - .003 thick

Copied from original parts and made from stainless steel.   Thickness .003"   This part tightens the barrel to jacket fit by 'shimming' the rear collar of the barrel.   This is a very useful part for accurizing you gun or just fixing...

Stemple U9 Trigger Pack

M31 Trigger Pack that has been parkerized and inspected for use in Stemple 76/45 setups U9, U9SF, U762, & U45   NOT FOR SEMI AUTO US-MADE GUNS. Video Link https://rumble.com/v6qjpeq-suomi-kp31-trigger-packs-in-stemple-7645-smgs.html

U45 Mag Housing (complete) - Black ABS Thermoplastic

STG Universal 45 acp mag housing for standard M3 Grease Gun Magazines. Machined from black machine-grade ABS thermoplastic; these are not as tough as the 7075 aluminum versions but are strong in all the right places to ensure reliable and durable...

U45 Mag Housing (complete) Aluminum NiB Plated - Black Distressed

STG Universal 45 acp mag housing for standard M3 Grease Gun Magazines. Machined from 7075 Aluminum and Finished with Hard Nickel Boron. Steel magazine insert stops protect the housing from hard slamming and the precision machined magazine catch...

U45 Mag Housing (complete) Aluminum NiB Plated - Silver

STG Universal 45 acp mag housing for standard M3 Grease Gun Magazines. Machined from 7075 Aluminum and Finished with Hard Nickel Boron. Steel magazine insert stops protect the housing from hard slamming and the precision machined magazine catch...

45 ACP Bolt for Adjustable Bolt System

STG Universal Adjustable Bolt System 45 acp Bolt   Reference Chart Below