Perfect barrel - please read - Criterion Barrels AR-15 HBAR Mid Length Gas System Barrel

I wanted a solid, do-everything barrel for my latest lefty AR-15 build. I shopped for a month until I came across Criterion HBAR barrels. Now, there is a bit of a weight difference between this barrel and what is normally slapped on an AR-15 from manufacturers BUT the weight has its benefits. Along with this barrel, I installed a Surefire Warcomp. The results are outstanding. There is practically no muzzle flip with the heavier barrel and the Warcomp. Many people say this about every kind of barrel/barrel attachment, but it rings true with this setup. The big reason I bought this barrel, is it uses a 1:8 twist rate - I tend to shoot 62gr which is fine with a 1:7 twist barrel, but I wanted to have stabilized 55gr rounds as well. With a 1:7 twist barrel, I noticed 55gr would tumble and yaw some while shooting at around 100 yards, or around 80 yards using boat tail ammo in 55gr. I have not had tumbling problems with 55gr using this 1:8 Criterion barrel unless I use boat tail ammo, but that is around 200 yards. Standard off the shelf 55gr shoots fine - zero tumbling, zero yaw. It also handles 62gr perfectly. This shoots SUB-MOA using match ammo!

If you have very weak arms due to age/disability/profession, I can understand trying to shave weight off of your rifle and looking elsewhere, but I would suggest you give it a try if you can afford to do so.