A while back, I tried boresighting my 450 Bushmaster with
a BSA collimator using the standard 45 cal bore spud and
Found it was too short due to the Izzy brake to be of
Any real help and the collimator was not tall enough.
To correct this, I purchased through Brownells, a collimator
Elevator part # 100-002-512 to address the height issue, but
Brownells quit carrying the extended 45 caliber bore stud.
I finally found these extended studs at Alley Supply in Nevada.
Here is the link.
http://www.alleysupply.com/default.asp?pc=sl
The spud is 18.50 plus 6 bucks shipping.
You can call and speak to Steve Alley and he can fix you up.
Yeah the collimator elevator is pricey, but you can use it
For any AR or other high scope mount and is adjustable to
Extremely high mounted scopes. It works great with my
BSA collimator kit. You can also get other caliber long bore
Spuds through Alley Supply.