We began working with Proof in 2016 to come up with a blank for Desert Tech SRS and Covert Rifles. In mid 2017 Proof Research began producing the barrel blanks to our specs and we have been spinning them into drop-in barrels for the SRS chassis system.

The first barrel blanks we received from Proof were in 26" and 28" lengths are set up with a shank that is long enough to do a barrel setback if wanted. We can also trim the shanks shorter to DT factory length to shave some additional weight off of the barrel if desired, which will also shorten the 26" and 28" barrels by approximately 1.4". We can also do barrel lengths ranging from 30” (.375 Cheytac) down to 18” (.308 Win.) depending on the setup you would like.

Each of our drop in Proof barrels comes with a 1/2 MOA guarantee with qualified match ammo.

These conversion kits include the completed ready to drop in barrel assembly, Bolt assembly, and magazine. The bolt stop is not included for short action calibers since it is not necessary for the bolt to function. If you would like the bolt stop you can order one from our Desert Tech accessories page. We can also provide a complete SRS-A2/M2 rifle build with one of our Proof barrels.

These custom barrel conversion kits will work in the chassis revisions listed below.
SRS Gen 2
SRS-A1
SRS-A2
SRS-M2
We can make conversion kits that will mount in the original first vision of the SRS Gen 1. Call for lead times since we don’t actively keep SRS Gen 1 compatible barrel extensions in stock.

Feel free to call us with any questions you may have.

If we have the barrel blank for your Conversion kit in stock, typical lead times are around 8 to 12 weeks. We have barrel blanks on order with Proof Research for monthly deliveries to keep our inventory stocked to reduce wait times. Some barrels may take as long as 16 weeks depending on special ordered features. Please contact us for estimated lead times.

If you don't see the caliber you are after offered here, please contact us for availability and pricing.

For the 6.5 PRC modifications need to be made to the magazine to allow it to feed correctly. These modifications increase the cost of the conversion kit by $80.

We are also able .223 Remington barrels and .223 Remington conversion kits on 22.5" Proof barrels. Since the .223 barrels and conversion kits use an aftermarket bolt head, barrel extension, and magazine there is a cost increase.

Muzzle brakes are not included on any of the barrels but can be purchased separately and even installed on the barrel before shipping if requested.

Once you add to cart you will be asked to select the Caliber, Barrel length, Twist Rate, and muzzle thread pattern. If you have any questions on what to select please contact Special Purpose Rifles and we can walk you through the process plus answer any questions.

After placing your order on our website, we will contact you to confirm your order specifications before we process your order and start the build.

Below are the barrel blanks with twist rates we typically stock and some of their popular corresponding calibers

- .224 Caliber - 1:7.5 Twist - 22.5” (.223 Remington, 22 Creedmoor))
- .243 Caliber - 1:7.5 Twist - 22.5”, 25”, 26” (6 Creedmoor)
- .264 Caliber - 1:8 Twist - 18”, 22.5”, 25”, 26” (6.5 Creedmoor, 6.5 PRC, .260 Rem)
- .284 Caliber - 1:8 Twist - 26” (7mm Rem Mag, 7mm WSM)
- .30 Caliber - 1:9 Twist - 18”, 22.5”, 25”, 26” (.308 Win, 300 Win Mag, 300 PRC, 300 Norma Mag)
- .338 Caliber - 1:9.4 Twist - 18”, 22.5”, 25”, 27”, 28” (.338 Lapua Mag, .338 Norma Mag)