Front edge of pin hole to back of inlet to front of inlet to tip of bolt 
OTP 7.7 - 8.7 - 11.5
JAM 7mm - 8.8mm - 11.5mm
Slik 7.43 - 8.69 - 11.5
Rudy 7.6 - 8.6 - 11.5
New wgp 7.7 - 8.4 - 11.38
98 STO 7.7 - 8.7 - 11.5
Old evo maybe 7.5 - 8.55 - 11.4
99 WGP sto 7.65 - 8.65 - 11.5
Shocktech  8 - 8.9 - 11.7