Stephen, this has a standard barrel - 10.5" Match Grade 416 Stainless Steel Barrel that's Threaded 1/2x28 TPI and a 1/7 twist rate.

Yo 1:7 rate of twist rate my brotha. It aint heavy.

1 :7 twist see ******* Specifications and Features:
Specifications and Features:
Bushmaster XM-15 Enhanced Patrolman's AR Pistol 91022
AR-15 Semi Auto Pistol
5.56 NATO accepts .223 Remington
30 Rounds
10.5" Match Grade 416 Stainless Steel Barrel
*******1:7 Twist
Threaded 1/2x28 TPI
3 Prong AAC Flash Hider
Phase 5 ambi single-point sling attachment
Barnes Free Float Quad Rail Handguard
Magpul Trigger Guard and Pistol Grip
Aluminum pistol buffer tube
Foam Cover
Overall Length 26.75"
Weight 5.2 lbs
10.5" Match Grade 416 Stainless Steel Barrel
1
Threaded 1/2x28 TPI
3 Prong AAC Flash Hider
Phase 5 ambi single-point sling attachment
Barnes Free Float Quad Rail Handguard
Magpul Trigger Guard and Pistol Grip
Aluminum pistol buffer tube
Foam Cover
Overall Length 26.75"
Weight 5.2 lbs

It’s standard and has a twist of 1:7 twist.