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. Yes, but I think the discussion is about a comparison of pencil profiles to M4 profiles, not M4 profiles to heavy profiles. From the gas block back to the receiver the barrel is straight. 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. but have M4 feed ramps. 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 . The Army's test showed a dramatic durability increase between the standard M4 barrel and the Heavy profile barrel. This pencil has a buttery-soft exterior, a replaceable eraser, an incense-cedar barrel, and a smooth, dark core. The plan is to test 4 barrel profiles (10.5" Faxon Pencil, 10.3" DD MK18, 11.5" BCM ELW Fluted, 11.5" BCM Gov't) suppressed and unsuppressed cold for POI shift and group size both between profiles and between suppressed and unsuppressed, then heat them up and repeat the test with hot barrels/suppressors. The original M16 was designed with a relatively thin and light barrel, now generally referred to as a "pencil" profile. Im not so concerned about barrel heat as Im just a recreational shooter but, the weight savings are what interest me. The barrel tapers from the gas block to the muzzle. The original AR15/M16/M16A1 rifle/carbine & original M16A2 carbine standard barrel profile is now called the "LWT" lightweight. Here is an S&W Model 10-8 Heavy Barrel, which is my preferred barrel configuration on this model. 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. As stated above, many refer to the LWT barrel as a PENCIL barrel. 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. 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. I think it’s possible that. Ive been reading a lot about light vs military barrels and have yet to make up my mind. As far as accuracy goes I’m not totally convinced pencil barrels walk when they heat up only because they are warmer. The common diameters are .750" for standard barrels and .936" for heavy barrels. It helps steady the rifle on target and absorbs recoil. https://www.everydaymarksman.co/equipment/ar-15-barrel-selection You can find LWT barrels with standard feed ramps and LWT M4 barrels that are the same profile/wt. 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