Knowledge Base

Topics > Questions Regarding Upper Receivers

Questions Regarding Upper Receivers (215 FAQs)

Top 10 FAQs For This Topic

	Will a Bushmaster upper receiver match up with my Colt lower?
	How is the Gas Piston System different?
	I have a Colt M16A1 (full auto) Lower Receiver, will your gas piston upper (or conversion kit) work with a full auto lower? (I'm concerned that the bolt differences might be a problem).
	i just bought an AR 15, and told it has the bushmaster upper, how can i find out if it is or not the only markings on the upper reciever is an A, on the barrel it has B MP 5.56 NATO 1/9, the front site has what looks to be a crown stamp ?
	what are the m16 parts that are not suppose to be in a civialians gun?
	Will the Bushmaster gas piston retrofit conversion kit work for a Colt M4 Carbine with 16" barrel and the "A" style front sight? If so, once installed, could the B.M.A.S. Split Four-Rail Handguard for Carbines also be installed?
	I want to buy another bushmaster upper receiver in same caliber .223, will the bolt I have now fit?
	Will you be developing a Gas Piston Operating System in 6.8 SPC?
	what are the markings of authentic flat top upper receiver of a real bushmaster?
	I have the XM15 E2S with a 16" barrel i am using the midwest industries picatinny for grips and yankeehill front folding sight with bayonet lug. Will the piston conversion fit/work with they 2 mods?

Recently Added FAQs To This Topic

	Has the barrel for the 6.8 upper always been SpecII or did it used to be SAAMI? Has the barrel always been 1:11 or did it used to be a different twist? Thanks
	I have the XM15 E2S with a 16" barrel i am using the midwest industries picatinny for grips and yankeehill front folding sight with bayonet lug. Will the piston conversion fit/work with they 2 mods?
	Will a bushmaster 6.8mm upper fit on a S&W M&P15 lower
	I have a Bushmaster M4A3 carbine with removable carry handle. I think this is a stupid question, but how do you remove the "removable" carry handle? Do I need any special tools to do this?
	Can your .308 rifle be converted to a .223 by simply changing out the upper and putting a magazine block in the magazine well?
	CAN I BUY A COMPLETE UPPER ASSEMBLY IF I LIVE IN CALIFORNIA.
	I have a Bushmaster Model XM15-E2S. Will the 7.62x39mm Carbine M4 Type Upper Receiver will fit the lower receiver of my AR?
	I purchased a BURA3B-16F upper assembly from Midway. It arrived with no manuals or paperwork other than the invoice from Midway. The Midway stock number is 935289. Are there any markings on the upper assembly to let me know this is a Bushmaster upper? How do I know I got the real thing? Thanks, George
	I have a Bushmaster 20" A-2 purchased new in late 1999. Looking to replace upper receiver with A-4. Did this model come with A-4 Feed Ramps/barrel? Just want to make sure new receiver is compatible with original barrel etc...Thank you.
	I would like to mount a Bushmaster AR 15 flattop to a Colt M16A1 Full Auto lower. Is this possible without many alterations or do I have to change the bolt and buffer spring as well?