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Posted: 12/14/2004 12:44:35 AM EDT
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I just received a 20" A2 upper with chrome lining. I can easily see that the chamber is chromed. The bore is extremely shiny but the crown shows no silver color and looks like it is just blued even after letting it sit with some CLP on it and wiping it down. This barrel is a Bushmaster stamped "B MP 5.56 NATO ...." and I thought there was supposed to be a C in there somewhere but I know it is chromed. I've seen many pictures here of crowns showing the chrome and am now wondering if it only shows after time and wear. Is it always supposed to be noticeable on a new barrel's crown? |
BM has never to my knowledge marked their barrels any other way then BMP 1/9 or 1/7. You should be able to see the chrome near the crown. All ar15s have feedramps. Some have deep M4 ramps but all have feedramps. |
| Thanks Boom. I can see the chrome inside the bore near the crown but not on the end of the barrel in the recessed area as I have seen in some photos of others' barrels. I was worried for a second when I first noticed it but after looking through the bore I saw it was lined. I found the answer to the ramp question in another thread. I was mistaking an M4 extension with a rifle extension. |
| I couldn't get a falsh suppressor because of stupid laws in this state so it just has a normal target crown. I was slightly concerned that maybe it had not been lined the entire length of the bore for some reason but I can see it at the crown so it's a non issue. Hopefully I will not have any questions for you tonight Tweak. |
. Picked it up last night right before the shop closed. Good thing I have today off. I've had 100 rounds of XM193 sitting around for a month waiting for this thing. I doubt it will be enough though.
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Thank you for the information Troy. I had read a recent thread which referred to an early 90's Bushmaster barrel marked "B C MP..." and that is why I had expected to see a C on the barrel. I guess they have since ended that practice for the same reason Tweak mentioned. The barrel was just very dirty when I first inspected it. So much black junk kept coming out of the barrel when I went to oil it that I ran the brush through it twice. That knocked enough of the crud loose to reveal the chrome near the crown. At first it honestly looked blued from the muzzle end but I knew it was not a DCM barrel. I had expected it to look like the muzzle of the barrel at the top of this thread but outside of the crown the muzzle on mine looks black. Link to thread with picture posted by Jedi |
Why is that? Do they finish the barrels after chroming in effect putting a layer over the chrome? I know the chrome is dull at first after they are lined but it seemed like I was getting more than just powder residue out of it. |
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