A-LOCK MUZZLE ADAPTOR

Where to buy in store: Stockists

It's a revolution in how you think about attaching your suppressor.

Muzzle thread adaptor system for A-TEC A-Lock compatible suppressors. Most of our centrefire suppressor range use the A-Lock attachment system. Once you go A-Lock, you won't go back to legacy threads.

Be sure to check out our A-Tec collection for our full range of suppressors or refer to our giant suppressor comparator below to see which models use the A-Lock:

Check out our Giant Suppressor Comparison Document

A-Lock Dimensions

• Threads 15x1 or smaller use the short A-Lock. Diameter: 21mm across the flange. Length: 15.15mm, does not extend forward of the thread.  
• Threads 16x1 or 5\8-24 and larger use the long A-Lock. Diameter 21.75mm across the rear body and steps down to 21mm across the flange. Length: 35mm, extends forward of the thread. 

Each A-Lock comes with a black Alu thread protector to protect it when the suppressor is detached. 

This product page is for the A-LOCK muzzle adaptor only.

This unit can be used in two ways:

• Adaptor locked on to the muzzle thread
• This allows our suppressors to be quick attached and detached in a second with a forceful 1/4 turn.
• This allows a single suppressor to be shared amongst multiple rifles all with different threads. In this case the calibre of the suppressor must be equal or greater than the largest calibre rifle.

• Adaptor locked inside the suppressor
• This allows the suppressor to be attached using muzzle threads like any conventional suppressor.
• When the suppressor is removed, nothing is left on the barrel thereby leaving the rifle aesthetic unchanged.

Thread systems available in variant selector

• All usual imperial threads.
• All usual metric threads.
• Custom Thread (stainless steel adapter -not blued) -let us know the desired thread pitch in the notes on checkout.

ATTACHMENT INSTRUCTIONS

We recommend using a gunsmith to check your muzzle thread concentricity, dimensions and alignment before fitting. We also recommend having as large a thread diameter as possible on your barrel, i.e. don't just get a 1/2"x20 thread, it's unsuitable for most calibres other than 22LR.

1. Check that the rifle is unloaded and remove the bolt from the action.
2. Do not do a test run of attaching the A-Lock adaptor into the suppressor as it will get stuck inside the suppressor.
3. Degrease (brake clean is best) the threads in the A-Lock and on the barrel.
4. Do a loose dry run of the adaptor onto the muzzle thread. Do not tighten yet, it might get stuck.
5. Check there is ZERO protrusion of the muzzle thread past the end of the adaptor. Protrusion of the muzzle thread will prevent the adaptor locking into the suppressor correctly. 
6. If the thread is protruding do not use this suppressor until the thread has been shortened to 15mm or less. Contact your gunsmith to rectify.
7. Check the A-Lock snugs perfectly against the muzzle thread shoulder, you should not see light between the A-Lock and the thread shoulder.
8. Remove thread adaptor from the barrel.
9. Apply strong and heat resistant thread lock adhesive (such as Loctite 263, Red) to the muzzle threads and inside the A-Lock. Use copious adhesive, do NOT use it sparingly.
10. Attach and tighten the A-Lock to the barrel by hand. Use a rag to get more purchase on the adaptor.
11. Wipe off all excess adhesive, especially on the A-Lock outer surface and threads. Dry patch the bore if Loctite got in there. Apply grease on the outside of the A-Lock.
12. Use the suppressor to apply required torque to the adaptor:
    ▪ Attach the suppressor, turning it only in the locking direction so that it does not loosen the adaptor. It will “clunk” down into position.
    ▪ Grasp the suppressor and tighten with moderate torque (6-8 Nm).
    ▪ Do not use extreme force, or the A-Lock threads may be damaged.
    ▪ Do not detach the suppressor.
13. Let the adhesive cure for 12-24hrs.
14. After curing. Ensure it is locking on correctly, attach and detach a few times to be sure.
15. Keep the A-Lock adaptor regularly greased or lightly oiled and do not let it completely dry out or it can seize inside the suppressor. If this happens, the suppressor should release when warm.
16. When storing, use the included A-Lock adaptor cap to protect the muzzle.