i am considering putting together a clone of the Bulgarian AKS 74 M1a1 and remember reading that the Bulgarian 7.62 trunion could be used if the 5.56x45 trunion wasn't available. K-var lists acouple of them, and was wondering which one would work best. Also, i have couple extra Bulgy 5.45 trunions. could i use the 5.45 trunnion instead? i know it is a 22mm instead of the 23mm of the 5.56/ 7.62 ( i can always turn the barrel 22mm), or are the locking lug recesses different on the 5.45 to?