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Posted: 1/15/2005 7:10:35 AM EDT
[#1]
Pull the handguards off and it will be stamped to let you know twist rate and whether or not it is chromelined. But, as a hint the only chrome bbl that RRA does are the DEA gun, the Governmet model (civilian DEA gun), and the R-4 bbl'd guns. You have to request chrome separate on the order unless it is a DEA or Gov't gun. The R-4 bbls are Wilson bbls.
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Posted: 1/15/2005 7:24:16 AM EDT
[#2]
Not all barrels are marked whether they are chromelined or not. The easiest and most sure way to tell is to take the upper off the lower, remove the bolt and chatging handle, and look to see if you see a silver ring around the chamber. If you do, it's chromelined. If there is no silver ring, it is not chromelined.
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Posted: 1/15/2005 7:45:24 AM EDT
[#3]
There isnt any markings on the barrel. The dealer told me that it was ordered as chromelined.
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Posted: 1/15/2005 8:27:34 AM EDT
[#4]
 Chrome around the muzzle.  Chrome around the chamber. -Troy |
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Posted: 1/15/2005 9:47:47 AM EDT
[#5]
Two more photographs of a chrome-lined RRA Entry Tactical to go along with Troy's:
 
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Posted: 1/15/2005 3:33:18 PM EDT
[#6]
Did you order the Entry Tactical or did your dealer have them in stock? If you ordered it, how long ago and where did you order it from?
The reason why I'm asking is because I've been waiting a while for one.. |
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Posted: 1/15/2005 3:41:49 PM EDT
[#7]
Where did you see that?  NO Rock River barrles are stamped, period. Yes, I know that Wilson makes ALL of the Rock River barrels and I have seen Wilson barrels that are marked with the twist and if it was crome lined, but RRA does not use the stamped barrels.
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Posted: 1/17/2005 5:51:33 PM EDT
[#8]
thank you, it is chrome lined
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Posted: 2/22/2005 9:01:02 AM EDT
[#9]
and if there is any doubt about it dab some cold blue on the supposed chrome. chrome doesn't blue.
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Posted: 3/2/2005 9:19:38 PM EDT
[#10]
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Posted: 3/2/2005 11:38:00 PM EDT
[#11]
neither of those pictured is a flash suppressor. one is a bare muzzle, the other is a some sort of slip over.
if your muzzle device is NOT permanently attached then it should be threaded on. if it's a brake of some sort then all bets are off. |
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Posted: 3/3/2005 3:04:15 AM EDT
[#12]
I've never seen any Rock River barrel marked or stamped with anything. I have seen Wilson barrels from other vendors that were marked with the twist and whether or not it was chromed. |
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Posted: 3/4/2005 6:51:15 AM EDT
[#13]
Tweak (as always) is correct. To elaborate on the "device" pictured in my post, it is a fake flash hider from RRA that slides around the tip of the barrel. It does nothing other than give the look of a flash hider and provide a little protection for the barrel crown. RRA installed them on rifles during the assault weapons ban when real flash hiders were restricted. Stupid stuff, both the ban and the fake flash hiders, but that is what we had to live with.
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Posted: 3/4/2005 7:04:39 AM EDT
[#14]
I just got a ban era RRA M4 barrel in and it is stamped "N9C" near the barrel extension. I'm guessing the "9" means 1/9 twist, the "C" means chrome lined, as it looks just like the chrome lined pics above, but the "N" has got me stumped.
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Posted: 3/4/2005 7:11:18 AM EDT
[#15]
For what its worth if youve got the pressed on fake flash suppressor, RRA will take your upper, cut the old worthless one off and thread and install a real flash suppressor for about 50 bucks. Makes the barrel exactly 16" so they permanantly attach it, but so is the pressed on so who cares.
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Posted: 3/4/2005 7:12:31 AM EDT
[#16]
I'm going to do it myself. 
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Posted: 3/4/2005 10:37:21 AM EDT
[#17]
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Posted: 3/4/2005 10:43:12 AM EDT
[#18]
Duhhhhhhhhh!!!!!!! 
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Posted: 3/4/2005 11:08:49 AM EDT
[#19]
 It says quite clearly "N 9 A" It has a 1/9 twist, and is not chrome-lined. Mongo, could the "N" mean NATO chamber? I haven't taken a casting or anything, but is that possible? ETA: I didn't see all of the posts before this because they probably came in while I was typing MY reply. I thought just about all RRA barrels came with the "compromise" (can't remember the correct term right now) chamber, not a NATO chamber. NOT THAT I'M COMPLAINING! |
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Posted: 3/5/2005 12:20:15 AM EDT
[#20]
OAI submitteed a similar article to ATF right after the ban was enacted, ATF rejected it because it was still a grenade launcher i.e. 22mm OD STANAG. 
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