Rifle Thread Spacer
RIFLE THREAD SPACER - 1/2x28 RIMFIRE
Many .22 LR barrels are threaded at AR-15 thread lengths, which are longer than the standard 0.400" recommended for rimfire suppressors. When threads are too long, the suppressor cannot fully seat against the barrel shoulder. This reduces blast chamber space and accelerates baffle erosion.
A rifle thread spacer corrects this by taking up the excess thread length so the suppressor shoulders correctly and stays concentric with the bore. It threads onto the barrel behind the suppressor and sits between the barrel shoulder and the suppressor's mount face.
Capitol Armory carries both the SilencerCo and Dead Air versions. Both are threaded 1/2x28 and work with all brands of rimfire suppressors.
- Shortens AR-15 thread length to standard rimfire (.22 LR) thread length
- Maintains concentricity between barrel and suppressor
- Provides correct blast chamber spacing to reduce baffle erosion
- 1/2x28 thread pitch
- Compatible with all brands of rimfire suppressors
- Dead Air version includes internal threads to stay attached when suppressor is removed
| Spec | SilencerCo Delta | Dead Air |
| SKU | AC114 | DA423 |
| Thread Pitch | 1/2x28 | 1/2x28 |
| Thickness | 0.25" | 0.25" |
| Outside Diameter | 0.67" | — |
| Material | Steel, Black Oxide | Steel |
| Internal Threads | — | Yes (stays on barrel) |
| For Barrels With Threads Longer Than | 0.400" | |
- Any rimfire suppressor with 1/2x28 direct thread mount
- For use on .22 LR barrels with 1/2x28 threads longer than the standard 0.400"
RIFLE THREAD SPACER
Many gun companies and gunsmiths make a common mistake and thread .22 LR barrels at AR-15 thread lengths. Most .22 silencers on the market will not shoulder correctly on AR-15 thread length. This spacer shortens AR-15 thread length to .22 LR thread length while ensuring concentricity. This spacer is threaded 1/2x28.
Manufactured by Dead Air or SilencerCo and for use with all brands of suppressors.
The SilencerCo Delta rifle thread spacer is .25" thick and has an outside diameter of .67". Part number AC114