The Army's test showed a dramatic durability increase between the standard M4 barrel and the Heavy profile barrel. Mass in the barrel can help you shoot more accurately and more comfortably. The thin barrel or ( Pencil Barrel ) as everyone calls it is .560 dia was the standard barrel until mid 2008 ( 580 series rifle ) that's when they changed to the tapered barrel or ( Heavy Barrel ) as ( SOME ) people call it .625 dia . From the gas block back to the receiver the barrel is straight. Yes, but I think the discussion is about a comparison of pencil profiles to M4 profiles, not M4 profiles to heavy profiles. It’s harder to have a perfect load for a pencil barrel harmonics wise; Pencil barrels introduce mirage issues that aren’t as pronounced with thicker/carbon barrels. Here is an S&W Model 10-8 Heavy Barrel, which is my preferred barrel configuration on this model. Just wanted to hear from other what their experience has been with this kind of hybrid profile barrel as it has the Gov't profile up until the mid length gas block, then after that it's a pencil barrel … You can find LWT barrels with standard feed ramps and LWT M4 barrels that are the same profile/wt. Im not so concerned about barrel heat as Im just a recreational shooter but, the weight savings are what interest me. The original AR15/M16/M16A1 rifle/carbine & original M16A2 carbine standard barrel profile is now called the "LWT" lightweight. Ive been reading a lot about light vs military barrels and have yet to make up my mind. This pencil has a buttery-soft exterior, a replaceable eraser, an incense-cedar barrel, and a smooth, dark core. It helps steady the rifle on target and absorbs recoil. The barrel tapers from the gas block to the muzzle. The common diameters are .750" for standard barrels and .936" for heavy barrels. I'm really close to getting a 16 inch 5.56 Faxon Gunner barrel for an AR upper build I'm going to be doing. As stated above, many refer to the LWT barrel as a PENCIL barrel. but have M4 feed ramps. When it comes to barrel diameter you do need to pay attention to the diameter of barrel at the gas block if your barrel doesn't come with one installed. When I triggered a frisky load, the pencil-thin barrel would whip up as if yanked from the heavens, the rifle’s comb cracking my molars. I think it’s possible that. The standard barrel is tapered and is sometimes referred to as the “skinny” or “pencil” barrel while the larger-OD heavy barrel is not tapered and imitates a piece of blued pipe. 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