White Oak just built me an 18" upper using their SPR barrel at 1:7.

Talk to John there about your concerns. I surely did. He only shoots 50,000K rounds or so a year with his 1:7.

I have shot as low as 50's with my 1:7 and all have been very, very accurate...

I shoot 60 Vmax's from mine...

- Greg

Success is found at the intersection of planning, hard work, and stubbornness.