How about a 50 caliber upper for your AR lower? It’s not really a new idea, but the folks at Safety Harbor Firearms do as nice a job as anyone at this.
They offer both single shot and magazine fed bolt action conversion uppers for AR lowers. It does require a hammer and spring replacement available from their web site. Complete rifles are available as well. These are all in what I would call carbine configuration with barrels in 18″, 22″ and 29″. I suppose the AR lower limits the amount of weight that can be put out front, so barrel length is relatively short for a 50.
Prices for an upper alone start at around $1450 so it is very cost effective if you want to own a 50. With new restrictions on the radar being able to reuse your lower on some other gun may be an important option in the future.
Average of 3 shots.
Temperature was 90+F.
Humdity was 85%.
Ammo: Summit/French Reloaded M33 Ball
Distance from muzzle to chronograph: 20 Feet