03-19-2021, 01:39 AM
He's done and even better, he works! Final tally on the scale is 6.84 lbs scoped. And that includes the pig sized Sadlak clamp on gas block which tips the scale at 1.9 oz instead of the 1.1 oz Faxon lightweight block I wanted to use. Basically, the gas block journal is too big - measures in at .754" while the Faxon is 0.753". It scraped my Duracoat (in a rattle can) off trying to get the Faxon on and could only get it up halfway. I'm sure that Rebby and Lilja would have taken care of it, but that would be a PIA and require patience. So I figured I could get a clamp on up there (which I like better anyways) and a Sadlak (makers of quality AR parts since ....... I don't know when - I've never heard of them!) was all I could find.
Felt recoil with a light charge and a 90 grain Sierra FMJ was quite a bit more than GiGi's 95 gr TMK load, but that should be expected. The good news is that the 2A Armament Ti Bolt Carrier really does its job. Return to battery is where I always get moved a little off target for follow ups and the decreased mass really helps. I don't think the return to battery dip is any worse than with GiGi and her JP Low Mass carrier.
Head space with a Maxim bolt with the Lilja barrel is perfect. Sized my 5 pieces of brass down to SAAMI minimum. 1.183 base to B comparator line and they came out at 1.188.
Now I just need to decide which Starline brass he gets - the nickel or the ordinary - and then lube up the trimmer.
- Actually, he's not quite done - a JP thermal dissipator is likely in the cards. Which will unfortunately put him a tad over 7lbs, but he will likely see up to 20 rounds in 90 seconds if I use him for my "Accurized AR Match". Planning for the dissipator made the decision to go with the Odin O2 Lite easy since a dissapator wouldn't fit under most of the other super lightweight options out there (excluding carbon fiber, which I didn't view as an option given its insulating properties and likelyhood that it would get extremely scuffed up getting rested on props, rocks, etc.)