Brownells Gunsmith Tech Corner - November 2011

Brownells Gunsmith Corner

Rolling Thunder Comp Tuning
By Jesse Tischauser

Benny Hill, builder of the Rolling Thunder Comp told me how to do this.

I just tuned mine this weekend on the back of my pickup with a cordless drill and 20 rounds of 223. I am a righty so I hold the forearm with my left hand. That left hand is placed as far out front as it can go on the handguard. The recoil impulse sends the gun the opposite direction of that left hand, which is up and right. I started with the smallest drill bit in my trusty cheapo Craftsman drill bit box and made a hole on the 3 o'clock position of the compensator(or as close to 3 as I could eyeball), 90° from the small hole on the top. I then fired 2-3 rounds at an IPSC target 15-20 yds away and watched the dot in my Accupoint rise to the upper right. I drilled the hole bigger using the next bit size larger and shot 2-3 more while observing the dot rise and fall. I did this two or three more times until the dot only moved upwards. I then opened up the hole on the top of the Rolling Thunder one more size and BOOM! No more dot movement. It’s a beautiful thing. Here are some pics.

Right Side

Top

Left Side