Accuracy build help

[tacomHQ]

JP does make a very nice bcg. I have been running their enhanced high pressure bcg with bolt in my ar308 for some time now. Works great and the small diameter firing pin solved my pierced primer problem.

JP makes excellent buffer assemblies, bolt carriers, barrel extensions... guns.
This build uses the first three noted items (Silent Captured Buffer, Standard weight bolt carrier) and runs "like a sewing machine". Very quiet gun on target.
AR10 .260Rem
Aero upper and lower
Vortex Gen ll 3-18
Broughton barrel 1-7.5T
Magpul stock
Accu-Tac bipod
Structured Barrel an custom gas block.

The barrel has way north of 1500rounds on it.
The group shown is 26-30 out of a 30round group at 100yds (5 shot groups, consecutive, 15 to 30sec shot times) . This would have easily continued for the next 20 to 40rds. Front bipod and rear bag.
Temp 58deg, wind 4:30 to 3:00, 6-20+mph. Federal Gold Match 142gr. Final barrel temperature 85deg and fully cool in <15min. Mag fed.
13lbs as shown.

We are building three complete JP's: 6.5CM, 6xc, 6dasher.

 

[tacomHQ]

View attachment 531278View attachment 531279
JP makes excellent buffer assemblies, bolt carriers, barrel extensions... guns.
This build uses the first three noted items (Silent Captured Buffer, Standard weight bolt carrier) and runs "like a sewing machine". Very quiet gun on target.
AR10 .260Rem
Aero upper and lower
Vortex Gen ll 3-18
Broughton barrel 1-7.5T
Magpul stock
Accu-Tac bipod
Structured Barrel an custom gas block.

The barrel has way north of 1500rounds on it.
The group shown is 26-30 out of a 30round group at 100yds (5 shot groups, consecutive, 15 to 30sec shot times) . This would have easily continued for the next 20 to 40rds. Front bipod and rear bag.
Temp 58deg, wind 4:30 to 3:00, 6-20+mph. Federal Gold Match 142gr. Final barrel temperature 85deg and fully cool in <15min. Mag fed.
13lbs as shown.

We are building three complete JP's: 6.5CM, 6xc, 6dasher.

As a note: we have been challenged (Thoughts on Structured Barrels) for a "data" and extended groups. We are starting at 30rd groups. Our 6xc was shown at 40rds (shown) , 300Norma x30rds (shown), etc.... We expect to take those values into the 50's to 100 values before drift shows up. This gun will run multiple bullet weights on the same 100yd zero.

 

[Lee7588]

I will first say I didn't read all of the post in this thread. I have a tool from Brownells that somewhat trues up the face where the barrel mounts the upper. I use 600 grit lapping compound and a hand drill. My groups have tightened up substantially after doing this.

AR-15/M16 UPPER RECEIVER LAPPING TOOL | Brownells

Cold-rolled steel lapping tool chucks into a 3/8' hand drill to easily “square” the upper receiver face on your AR-15. Helps ensure precise mating of barrel and receiver for added accuracy. Coat face of receiver with aluminum-oxide lapping compoun...

www.brownells.com

 

[C-130 Dude]

As a note: we have been challenged (Thoughts on Structured Barrels) for a "data" and extended groups. We are starting at 30rd groups. Our 6xc was shown at 40rds (shown) View attachment 531446View attachment 531449, 300Norma x30rds (shown), etc.... We expect to take those values into the 50's to 100 values before drift shows up. This gun will run multiple bullet weights on the same 100yd zero.

AR308 can be accurate as some of us know. Sometimes it takes a while to get them tuned. And sometimes with a bit of trial and error. Below is my Ar308:
Aero upper
JP handguard
Criterion 20" barrel
JP enhanced high pressure bcg w/bolt and small dia firing pin
Radian charging handle
Magpul enhanced stock extention
Ar15 h4 buffer
Sprinco orange spring
Superlative adj gas block
DPMS lower gen 1
Timney 4 lb AR trigger
American Defense scope mount
Vortex Strike Eagle 5x25x56 moa

Sierra 168 tmk
IMR4064 43.2 grs
LC 15 brass (bought new, once fired by me)
CCI 34 primers

Targets were from 2022 and 2023. 30 shots each target. 100 yards. Magazine fed.