Posted: 9/17/2013 4:42:31 PM EDT
I have a complete bushmaster 20" HBAR ive had since 2004 and love it . I got it set up with scope and it shoots great. now for the question. Can I use the same lower and put another brand upper on it like a Rock river or dpms or anything like that (5.56 of course) just change them out when I want? may have a chance to buy a complete upper 16 inch flat top in a week or two and wanted to make sure I could swap them back and forth with no problems. All is like new. Then when funds allow get another lower. thank in advance for the help. I think im good to go but just want to make sure if there is something im over looking or need to know its been a few years since ive bought anything for them.
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Quoted:
Not entirely true. While there are a number of calibers that will work with a standard lower, there are many that absolutely do not. Quoted:
Quoted:
You can put any caliber upper you want on it, your not stuck with 5.56 For OP's reference- AR-15, without bolt modification .17 Remington .17/223 .20 Tactical .20 Practical .20 Vartag .204 Ruger .221 Fireball .222 Remington .222 Remington Magnum .223 Remington (5.56x45mm) .223 Remington Ackley Improved 6x45mm 6mm TCU 6x47mm 6mm Whisper .25x45mm 6.5mm Whisper 7mm Whisper 7mm TCU .300 Whisper (.300/221, .300 Fireball) .338 Whisper AR-15, with bolt modification 223 WSSM 5.45x39mm (.21 Genghis) 243 WSSM 6mm PPC 6mm WOA 6mm BR Remington 6mm Hagar 6.5mm PPC 6.5 WSSM 6.5 WOA 6.5mm Grendel 25 WSSM 6.8x43mm SPC .30 Herrett Rimless Tactical (6.8x43mm case trimmed to 41mm and necked up to .308; the 6.8mm version of the .300 Whisper) 7.62x25 7.62x39mm .30 RAR 300 OSSM .357 Auto .35 Gremlin (necked up 6.5 Grendel to 358) .358 WSSM (various names, but all are some form of a WSSM necked up to 35 caliber, some are shortened to make them big game legal in Indiana) .458 SOCOM .50 Action Express .50 Beowulf AR-15 using a simple blowback operation .17 HMR .22 LR .22 WMR 9x19mm 9x21 9x23 30 Carbine 357 Sig 40S&W 400 Cor-Bon 41 Action Express 10mm Auto 45 GAP 45ACP 45 Super 45 Win Mag This list is in no way complete. This list does not include complete different uppers like the FN 5.7 or the one that shoots .410 shotgun, crossbow bolts or bolt action uppers like the 50BMG |