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View Full Version : Okay, I'm An Idiot - Help Me Identify This Barrel


OneGuy67
08-07-2013, 22:51
I am an educated and pretty smart guy, but I just pulled a doozy of a stupid stunt.

I was in the market for a cheap AR barrel and I got one off of eBay pretty cheap. The guy advertised it as a Bushmaster barrel and I snatched it up without really looking at the barrel as close as I should have. The auction was closing and I bidded quickly. No excuse, just what happened. Anyway, I received it in the mail today and the dang thing has threads!

Now, I have to figure out what I have. The markings on the end of the barrel are: B MP 5.56 1/9.

What do I have?

http://i828.photobucket.com/albums/zz210/bluebouyz/DSCF0003_zps4aaca9fa.jpg (http://s828.photobucket.com/user/bluebouyz/media/DSCF0003_zps4aaca9fa.jpg.html)

http://i828.photobucket.com/albums/zz210/bluebouyz/DSCF0004_zpsac4b7b08.jpg (http://s828.photobucket.com/user/bluebouyz/media/DSCF0004_zpsac4b7b08.jpg.html)

http://i828.photobucket.com/albums/zz210/bluebouyz/DSCF0007_zps307c77d4.jpg (http://s828.photobucket.com/user/bluebouyz/media/DSCF0007_zps307c77d4.jpg.html)
twitchyfinger
08-07-2013, 23:08
The B (for Bushmaster), MP stands for "magnetic particle" tested, 5.56mm caliber, 1/9 indicates twist rate.

It's also missing the barrel extension that's why you see the threads like that. Looks to me like it was someone's botched piston kit build but I'm viewing your pics from my phone right now too!
RonMexico
08-07-2013, 23:18
This^^^^
just toss a barrel extension on and get it headspaced properly, then toss on a new gas block if your going DI. In the end you may have got a killer deal. I would take it to bowers and let Rob set it up.
Kraven251
08-07-2013, 23:19
This^^^^
just toss a barrel extension on and get it headspaced properly, then toss on a new gas block if your going DI. In the end you may have got a killer deal. I would take it to bowers and let Rob set it up.

just explain you got it like that or you might make the story of the day [ROFL1]
BushMasterBoy
08-07-2013, 23:35
needs one of these ... http://www.brownells.com/items/ar-15-barrel-extension.aspx
BushMasterBoy
08-07-2013, 23:39
Let me know if you want to sell it or trade. I do have a brand new barrel sitting on a shelf...
Dave
08-08-2013, 07:30
Looks like someone was trying to do a piston setup and might have messed things up. You might want to get BP or Bowers to have a look at it before trying to use it.
OneGuy67
08-08-2013, 13:16
Thanks guys! I should have realized that myself, but we have a newborn in the house and sleep seems to be a commodity I'm lacking (that is the excuse I'm going to use anyway!!).
OneGuy67
08-08-2013, 13:17
Let me know if you want to sell it or trade. I do have a brand new barrel sitting on a shelf...


Maybe....watcha got?
BushMasterBoy
08-08-2013, 21:26
It is one of these! I will throw in birdcage flash hider and front sight base with pins...http://www.sportsmansguide.com/net/cb/16-inch-m4-style-barrel.aspx?a=606333
OneGuy67
08-09-2013, 15:38
Looks like someone was trying to do a piston setup and might have messed things up. You might want to get BP or Bowers to have a look at it before trying to use it.

Well, Rob wasn't interested in assisting with this.
ray1970
08-09-2013, 16:21
My guess is that by the time you buy a barrel extension and pay someone competent to fit and install it, you could probably just buy a barrel ready to go.

Might make a neat project for a beginner gunsmith or someone with some free time and ambition.