Sure gluing in limits you being able to mess with headspace but also can affect accuracy/consistency if you use the grub screws. You dont have a true custom fit barrel if your shimming....I based the Keystone group buy and specific things we did in that group buy after picking Don's head for the past 8 months or so.
There's a reason he glued his barrels in and that reason someone just stated above.... Yes, headspace is typically set for the ammo you are going to use. But I have found, after testing every barrel mentioned in this thread plus some that 0.041" headspace on the true custom fit barrels straight hammers. Especially with lower end ammo, not Tenex, R50, etc... CCI SV, SK RM, SK +, FGMM 922A.... That;'s why I picked 0.041" headspace for the group buy. Talk to
@A-Rob I think he will tell you how thats working out for him accuracy wise
I am doing some testing with Bartlein right now with there semi-custom and a full custom CZ barrel. I am about to post results on their semi-custom barrel. 0.900" straight blank any length you want really. They use the Benz chamber, tighter than factory barrel tenon OD (not full custom fit but much tighter than factory). What I've found testing this barrel over the last 2 months is it doesnt shoot the cheap stuff as consistently or accurately as the full customs to my specs from Keystone but they HAMMER consistently with R50. Over and over.
I sent my custom 22lr reamer (made exactly to Don's specs he gave me) along with my 455 action to Frank and hes doing a full custom barrel this time, tenon custom fit to my action, 0.900" straight blank, 20", muzzle threaded 1/2-28", and headspace set to my requested 0.041".... I will do a full comparison of both Bartleins semi-custom drop in and there full custom option.
Sorry but I just didnt have luck with the Lilja, even with adjusting headspace with shims.. It didnt come close to the Keystone GM custom barrels or the Bartleins. Id be interested to do a test barrel with a Lilja blank using my reamer and specs custom fit to my action but I personally wouldnt waste my money on their grub screw, semi-custom, shimmed drops ins if ultimate accuracy was my goal to be on par with a Vudoo... Just my $0.02
After testing them all, if I wanted the most accurate barrel available for purchase today outside special runs/group buys, I would be buying a Bartlein. And I must be half accurate on that statement because last I talked to Frank back in the beginning of June about these 22lr CZ barrels he had a batch going through the shop of 41pcs and they were all sold. He had a second batch behind it of 30pcs as well. Not sure on the sold vs available is as of today on that second batch of 30pcs..