PRE-ORDER Guidance
As you are probably aware, recent updates to ATF's eForm approval process has resulted in drastically improved turnaround times. While this is certainly a positive change, it has also had a predictable impact on suppressor inventory across the industry.
With that in mind, if you know you want a particular suppressor (or three) and it isn't in stock, your best bet is to place a "PRE-ORDER" so that we can purchase your desired suppressor the moment it becomes available from our distributors. If you wait until it shows in-stock on the website, you might miss your opportunity. PRE-ORDER helps us seek out and purchase what you are looking for. This is true whether you buy from us or someone else.
Thank you for considering Longbow Arms, we hope to earn your business.

R2S - Nitride
- 17-4 PH
- Atlas and Atlas XL compatible
- Plan B compatible
- Black Nitride finish (67 HRC Surface hardness)
- Shims not included, if you would like to specifically time this, shims will be required.
- Note: your barrel may require a shim if the manufacturer did not put a thread relief on it.
| Thread Pitch | Weight | Length | Length Added |
| 1/2-28 | 2.05 oz | 1.74″ | 1.115″ |
| 1/2-28 Tapered | 2.0 oz | 1.74″ | 0.9275″ |
| 5/8-24 Tapered | 1.75 oz | 1.74″ | 0.9275″ |
| 5/8-24 | 1.6 oz | 1.74″ | 1.115″ |
| 14×1 LH | 2.01 oz | 1.74″ | 1.215″ |
| 13.5×1 LH | 1.8 oz | 1.74″ | 0.99″ |
These fit Plan B type mounts. Always use an alignment rod to ensure that the entire system is set up correctly. Make sure all surfaces are cleaned and the muzzle device has been torqued and Rockset to the barrel. Use on a Q can voids your warranty, be warned.
Torque the muzzle device to approximately 30 ft lbs. Make sure the muzzle device is square against the shoulder. When setting the silencer on the muzzle device, ensure that the threads and tapers are clean. Torque the suppressor to 10 ft lbs. Ensure alignment. Enjoy. The nitride finish does lead to a tighter seal, with that said, it is extremely important to torque and rockset your muzzle device to the barrel properly.
Inventory and Ordering Guidance
Longbow Arms attempts to keep popular items in stock, however, if you want something not listed on the site, please reach out to us so we can discuss ordering that item. Under normal conditions, non-NFA items can be ordered and received within 5-10 business days.
For NFA items, Dealer to Dealer and Manufacturer to Dealer transfers are subject to eForm 3 approval times which are currently running 7-14 days.
