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so my OB kit came in today with the tsc part 66. install was quick and easy. Altho I do have some problems. Some how my bolt catch is sitting to high and wont allow the bolt to travel at all. Im going to have to file or grind it down. With the TSC part 66 my stock now slides up and down about an 1/8th of an inch, ill have to find something to stuff in the pocket to keep the stock tight and keep it from sliding. Also I have figured it out. I have found out how part 66 is $30, its cast 7075 and then was machined. Much like the upper receiver of the scar. I am amazed at how accurate and close the grouping is even on full auto, definitely worth the money
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