Im not sure what thread or size bore (if applicable) the Dye ultralite back is, I tried it on both my Sp1 and my shocker sport and did not fit (can post pics of threads a little later if needed or if anyone can tell)
threads are in good shape over all barrel 9.5/10 due to being used
flat black (non gloss)
35 shipped..+$2 for tracking and insurance. (obo)
Aluminum freak inserts
two small marks on blue insert one small mark on black, both in great shape with no issues.
blue insert 689
black insert 693
$13 (each) shipped parcel post padded envelope $15 (each) small flat rate box..
buy both inserts $25 shipped,tracked and insured flat rate box. NO TRADES,FSO,DO NOT OFFER TRADES PLEASE!