Yes, strength is definitely a plus!
An AR-type rifle outfitted for long-range target work is usually
significantly heavier than a stock M16 or M4. The longer, heavier
('bull') barrel, free-floating aluminium handguard, optics,
buttstock counterweight and bipod all add to the overall weight.
For example, the target AR in my previous post weighs in at
approximately 14.5 lbs. (about 6.6 kg.) without the magazine.
Fortunately, I don't have to lug it around like I would a combat
rifle. 