i am looking to get the 4465 model S&K mount for my M38. can anyone give me info on whether it is made of steel or aluminum? i had read that they are steel and cost around $80. on Brownell's they have the 4465 mount for $55 but they say it is aluminum. is this a typo? are there two different kinds? is this the same mount ect? any help would be great. im confused.