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Posted: 9/18/2003 8:59:12 PM EDT
I've got an ARMS 40 and I have heard that you might need to get a taller front sight post from Bushmaster to zero it if you don't have a Colt Barrel. I've got a Bushmaster barrel (front sight tower foundry code of "9 R and a crown). Any thoughts?
Thanks!
mrf2
Link Posted: 9/18/2003 11:06:34 PM EDT
Originally Posted By Mrf2: I've got an ARMS 40 and I have heard that you might need to get a taller front sight post from Bushmaster to zero it if you don't have a Colt Barrel. I've got a Bushmaster barrel (front sight tower foundry code of "9 R and a crown). Any thoughts? Thanks! mrf2
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i thought that [i]colt[/i] was the one that used a taller front sight post, because their original removable carry handle was taller than normal A2 carry handles.. and others (armalite, bushwhacker, RRA, so forth) use a standard front post, which does indeed work w/the #40... or GG&G's or KAC's for that matter others can elaborate/correct me... Hope this helps!!
Link Posted: 9/18/2003 11:33:56 PM EDT
Link Posted: 9/19/2003 8:16:14 AM EDT
Alot more may depend on whose flat top upper you have. All A3 uppers are not the same. As CB has stated many times, your ARMS #40 was designed to be used with a GI spec upper and barrel. You have something different, it's a gamble.
Link Posted: 9/19/2003 9:05:08 AM EDT
Thanks for the info, very interesting. I've got an RRA upper so I'll be interested to find out this weekend. Thanks! mrf2
Link Posted: 9/19/2003 10:20:49 AM EDT
Mrf - I too have an RRA with a FT and an A.R.M.S. #40 - no problem. Good luck
Link Posted: 9/19/2003 11:33:03 AM EDT
Link Posted: 9/19/2003 12:43:02 PM EDT
I have an RRA upper and A3 receiver with a #40 newly mounted. I sighted in this last weekend and noted that my front sight was a lot higher than I was comfortable with. The top of the post is at or slightly above the front sight "ears". Also the post is a little wobbly. I am going to see how many courses of thread hold that post in there. My Bushy is not like this. I suspect I might need the longer front post. I'll update you when I get this issue figured out. Jeff D.
Link Posted: 9/19/2003 12:46:08 PM EDT
Regardless of where a manufacturing error occurs, front sight base or rear rail, its an elevation variation. This variation is where you get in trouble. Granted there seem to be more problems steming from front sight housing variations but the rail on the receiver is a problem shown to occur as well.
Link Posted: 9/19/2003 4:12:25 PM EDT
Short/std. ht. front sight bases are for full length barrels, the higher base is for 14.5/16" lentgth carbine barrels. The after market makers did not do thier trigonometry, that's the touble with after market reverse engineered not to mil spec products. Example, If you were to put an 8 inch barrel on, you would need an even higher front sight base, or at least a higher front post. Mil spec rear sights are required to be a certain ht. off the center line of the bore and the flat top receiver dovetails off of that. Good shootin, Jack Good shootin< Jack
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