450Bushmaster.net

I am looking for caliber specific cleaning rod bore guides > Mike Lucas makes an excellent bore guide , and he makes one for the 5.56 AR 15 , but he doesn't make one for the 300 Blackout , or the the 450 Bushmaster , at least in the AR Platform . Any suggestions where I can find caliber specific bore guides for AR 300 Blackout , and AR 450 Bushmaster ?

Brownells has one for the 450 Bushmaster and Midway has one for the 300 Blackout