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1/25/2018 7:38:29 AM
Posted: 7/30/2003 7:05:47 PM EST
[Last Edit: 7/30/2003 7:07:02 PM EST by G35]
I have a new Bushmaster 20" A3 rifle. I am replacing the upper recevier with a new Bushmaster A-1 upper recevier. Will I have any problem with the front-sight tower hieght not being compatitable ?

And for future reference, are the Bushmaster A3, A2, and A1 upper recievers interchangable in regards to Bushmaster barrel assemblies ? In other words, if I order a Bushmaster barrel assemble, can I mount it to either a Bushmaster A1, A2, or A3 upper reciever and not worry about sight problems (other than the dreaded index pin alignment problem - but let's save that for another thread) ?
Link Posted: 7/31/2003 1:19:37 AM EST
Should work. The only sight height problems I am aware of are with the Colt M4. They require a Colt removable carry handle to get correct sight alignment. I don't know if all Colt M4's are this way.
Link Posted: 7/31/2003 5:56:34 AM EST
Answer is YES. I had this discussion with a BM tech the other day. The Colt front is 40/1000" inch higher causing the problem. BM is uniform.
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