Knowledge Base - Topic : Questions Regarding Barrels to our knowledge Base Center. Here you will quickly find answers to some of our most commonly asked questions.FAQ # 2712 : Does the barrel on the Bushmaster Varminter Rifle come chrome lined? I know stainless barrels are not but this rifle is made of 5150 mil spec. steel correct? Thanks, Neil, 18 Sep 2010 00:00:00 GMTFAQ # 2684 : Do 6.8 spc barrels have chrome chambers and bores? Thanks, Jim., 01 Sep 2010 00:00:00 GMTFAQ # 2579 : I have a Remington R15. I understand that it is actually manufactured by Bushmaster. The barrel is stamped .223. I own a Bushmaster Varminter 24 inch upper and a Bushmaster Predator 20 inch upper. In comparing the uppers, side by side it is obvious that the R15 upper is made by Bushmaster. I have considerable experience with AR15 rifles and their ammunition and find it hard to believe that the R15, manufactured by Bushmaster would have a barrel that has a different leade that would restrict it from firing 5.56 ammunition. Can I fire 5.56 ammo in my R15 without problems?, 10 Jul 2010 00:00:00 GMTFAQ # 2576 : I purchased a carbon 15 with a superlight barrel. I would like to put a 16" bull barrel on it. Do I need any special adaptive parts to match an AR 15 16" bull to the carbon 15 upper?, 10 Jul 2010 00:00:00 GMTFAQ # 2501 : Few questions about 16" patrolmans m4 carbine barrel. Is it chrome lined and do you know the twist rate?, 04 Jun 2010 00:00:00 GMTFAQ # 2434 : I recently purchased a Bushmaster AR15 M4/A3 rifle and an AR conversion kit 223/5.56mm to a 22LR. Will it hurt or damage the barrel accuracy for 223 ammo if using 22LR during gun/barrel break-in period?, 29 Apr 2010 00:00:00 GMTFAQ # 2428 : I Recnetly Purchased A Bush Mmaster M4/A3 Rifle and Also A ARC Conversion 223/5.56mm to22lr Kit My Question is Will it Hert or Damage the Barrels Accuracy For 223 ammo Later if uesing 22lr During Gun/Barrels Break-in period, 26 Apr 2010 00:00:00 GMTFAQ # 2411 : Is the SS barrel in Varmint Special chrome lined or is the chrome lining only in the standard barrels?, 18 Apr 2010 00:00:00 GMTFAQ # 2394 : I have a 76' sp1 colt ar-15. However it has the rifle front handguard with a carbine barrel. My question is will I be able to purchase a carbine front handguard and gas tube and just slide the front site back to make it correct on barrel. Or should I just get a rifle barrel?, 10 Apr 2010 00:00:00 GMTFAQ # 2390 : Is the ACR barrel more durable than chrome lined barrels, such as the M4 barrel? What is it lined with? Thank You Reuben, 09 Apr 2010 00:00:00 GMTFAQ # 2370 : I just sent an e-mail regarding the ability to purchase a DCM rifle in MA. I have another question, I already own one of your DCM rifles I purchased when I lived in Michigan (I bought it around 1998 or 1999). This barrel appears to be chrome lined and I think I read in the literature that accompanied the rifle that it was chrome lined. I now see that you make a point of noting that the DCM barrels are not chrome lined like most of your other barrels. I assume this means non-chrome lined is better in terms of accuracy. Can you explain the performance differences between chrome lined and non-chrome lined. Under what circumstances would one want to use a chrome lined barrel, and when would one want to use a non-chrome lined barrel. I appreciate any clarification you can provide. Best regards,, 03 Apr 2010 00:00:00 GMTFAQ # 2362 : Will a standard AR-15 barrel nut, Delta ring, spring etc fit the 450 bushmaster to replace the free float barrel nut?, 31 Mar 2010 00:00:00 GMTFAQ # 2352 : Are your M16 A2 barrels front sight bases F marked and will they work with the A3 flat top upper., 27 Mar 2010 00:00:00 GMTFAQ # 2282 : I have a bushmaster model XM15-E2S. BFI13776 These are the markings on the reciever. Can you tell me if it has a chrome lined barrel. I dont see any markings on the barrel unless they are under the handguard. thanks ,Vernon, 01 Mar 2010 00:00:00 GMTFAQ # 2273 : I recently bought a 6.8 caliber bushmaster and was wondering what the twist rate is and if it is chambered to the "SAM II" specs. The model number is XM15-E2S and on the barrel its stamped B MP 6.8 SPC 1/11....I'm assuming the 1/11 is the twist rate...could you please validate?, 27 Feb 2010 00:00:00 GMTFAQ # 2241 : It appears that the upper assembly with the 16" heavy barrel is slightly less expensive than the upper with the standard barrel. Why is this the case if the heavy barrel is better as stated in other FAQ's and not really that different in weight? By the way, how much does it cost to have the heavy barrel fluted? Can you flute the standard barrel?, 16 Feb 2010 00:00:00 GMTFAQ # 2236 : does the abbl-11.5wa or the m4 contour in 16 in come with m4 feed ramps, 15 Feb 2010 00:00:00 GMTFAQ # 2233 : I recently purchased one of your rifles with the fluted heavy barrel. I would like to put on a aftermarket low profile gas block and flash hider/compensator. Is the current flash hider fixed or is the barrel threaded?, 14 Feb 2010 00:00:00 GMTFAQ # 2231 : can one get a BushMaster with a non chrom barrel,i would like one wiyh a 18" fluted barrel with target crown? thank's, 14 Feb 2010 00:00:00 GMTFAQ # 2230 : What type of barrel is on my Xm15 E2S, 14 Feb 2010 00:00:00 GMTFAQ # 2219 : Are government profile barrels less accurate than HBAR barrels? I fire less than 250 rounds per trip to the range., 08 Feb 2010 00:00:00 GMTFAQ # 2194 : on the bushmaster ACR do the different caliber barrels come included along with the bolt carrier or do they have to be bought sperate., 26 Jan 2010 00:00:00 GMTFAQ # 2191 : Are the barrels for your new ACR rifle chrome lined? The specifications only say that they are “coated”., 25 Jan 2010 00:00:00 GMTFAQ # 2184 : I understand you dont sell a smith vortex 4 prong flash hider. Does it mean I cannot order a 14.5 barrel ( 1/7 twist) with a permanent vortex on it? If you have that set up for a barrel, I'm sure a lot of people out there are just waiting, phantom is inferior to the vortex IMHO., 24 Jan 2010 00:00:00 GMTFAQ # 2179 : Does metal case .223 ammo (such as Remington UMC) cause premature wear/damage to a chrome-lined barrel?, 23 Jan 2010 00:00:00 GMTFAQ # 2174 : My Bushmaster is XM15ES with an Izzy Flash Suppressor. My question is whether or not there are any aftermarket sound suppressors that fit over the Izzy as I believe that mine is permanently fixed to my barrel., 21 Jan 2010 00:00:00 GMTFAQ # 2155 : I am concerned about baffle strikes with 75-77 grain bullets through a suppressed bushmaster short barrel with 1/9 twist. What say you?, 17 Jan 2010 00:00:00 GMTFAQ # 2131 : what is the diameter of a 16" carbine heavy barrel forward of the frontsight assembly?, 04 Jan 2010 00:00:00 GMTFAQ # 2124 : CAN TRACERS BE SHOT IN YOUR GUNS W.OUT DIONG DAMAGE. THANKS, 03 Jan 2010 00:00:00 GMTFAQ # 2111 : Does the Bushmaster XM15-E2S with the A2 stock come with a chrome lined barrel?, 28 Dec 2009 00:00:00 GMT