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Posted: 11/21/2008 4:36:34 PM EDT
So I bought a new Dissy during their Fall sale and haven't shot it yet. I looked it over and noticed a faint lip on ramps where they meet. Am I going to have problems with this, or do I need to Dremel it or shoot the heck out of it. It looks to have been test fired by Bushmaster.
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Posted: 11/21/2008 4:43:57 PM EDT
[#1]
just shoot it
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Posted: 11/22/2008 1:33:48 AM EDT
[#2]
Quoted:
just shoot it What he said. |
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Posted: 11/22/2008 2:45:02 AM EDT
[#3]
Looks pretty normal to me. The upper and barrel extension are obviously machined before put together so there is going to a be a bit of tolerance. As long as it doesn't mis-feed, don't worry about it.
Like these guys said- just shoot it. |
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Posted: 11/22/2008 2:55:12 AM EDT
[#4]
LMT upper i had was worse than that, it functioned fine
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Posted: 11/22/2008 3:12:51 AM EDT
[#5]
How long has Bushmaster been doing M4 ramps? I never saw a factory gun with them before.
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Posted: 11/22/2008 4:43:00 AM EDT
[#6]
It shouldnt cause a problem but looks like the uppers ramps were poorly done.
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Posted: 11/22/2008 8:44:32 AM EDT
[#7]
Quoted:
It shouldnt cause a problem but looks like the uppers ramps were poorly done. What he said.. funny how some folks say Bushies and other big manufacturer's are better built than - say del-ton or m&a... sometimes i wonder. You should be fine with those ramps. |
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Posted: 11/22/2008 8:47:37 AM EDT
[#8]
Quoted:
How long has Bushmaster been doing M4 ramps? I never saw a factory gun with them before. They just recently started. |
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Posted: 11/22/2008 8:54:31 AM EDT
[#9]
I bet it takes 16 or more clicks to the left to zero.......
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Posted: 11/22/2008 8:56:34 AM EDT
[#10]
Are those really M4 ramps?
My Bushy upper's ramps look like that: 
But I'd thought M4 ramps were a little more pronounced: 
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Posted: 11/22/2008 9:01:24 AM EDT
[#11]
It looks like your barrel indexing could be off.
If you look at the direction of rotation and how the ramps are misaligned, it has all the indications of a barrel indexing problem. During barrel torquing, if there is enough play in the index slot of the upper receiver, the barrel can rotate slightly and the index pin can come to rest against the L/H side of the index slot of the upper receiver. 
If this is the case, as it might be with your upper receiver, the feed ramps would be off in the direction indicated. 
If the weapon zeros fine, and has no FTF issues, you could just leave it be. If you have the tools and the know-how, it might be correctable with 20 minutes worth of work. Again, if your not having issues with the rifle you might elect to let it be as is. |
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Posted: 11/22/2008 9:52:49 AM EDT
[#12]
I just looked at my Bushmaster and Armalite side by side and the Bushmaster seem to be just relife cuts and not true M4 feedramps my Armalite factory upper looks much different.
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