the sight fitted(right word?) snugly. it actually seemed to go in slightly easier with the loctite. i'm gonna use a punch and stake it tomorrow, hopefully not making it too ugly.
then....for no other reason than "i can", i'm ordering a bayonet lug adapter for it......because.....well.....i can.
according to chart this extended tube https://www.thordsencustoms.com/kak-tc-extended-buffer-tube-for-frs-15-and-ar-pistol/.html
with this upper assembly https://palmettostatearmory.com/psa-10-5-chf-carbine-length-5-56-nato-1-7-9-lightweight-m-lok-railed-upper-without-bcg-or-ch-51654486742.html
would put me at/over 26. Would this be correct?