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Some states for an ar15 to have features like pistol grip, collapsible stock, threaded barrel and so on it has to have a heavy barrel/thick barrel. So if it has a heavy barrel then it can have those features. So this is like any other ar15 just has a heavy barrel Wich alot of people prefer. You have pencil barrel/light barrel, government/medium thickness and heavy. Hope this helps.

Christopher, HBAR = Heavy Barrel means the barrel has a straight profile and not the cut-out seen in M4 Barrels. Excellent picture here : https://www.virtustac.com/virtus-tactical-match-grade-barrel.html

Christopher, HBAR stands for heavy barrel, or heavy barrel automatic rifle. This type of barrel has a consistent heavier barrel wall thickness than standard issue, and is a common upgrade for AR15 type rifles. The heavy barrel dampens harmonic vibrations as a bullet moves through the barrel, so bullet groupings at a distance are tighter, and the MOA is smaller. The friction of a bullet moving through the barrel generates heat which causes some warping to the barrel. Heavy barrels warp less, which also makes them more accurate. A heavier contour heats up slowly and takes a while to cool off, while a lighter contour is quicker both to heat and cool. Have a great day!