I assume you're unaware of the fact that uppers an lowers on the AR15 platform can be switched about in a matter of seconds.What a waste of a receiver.
Wait a minute . . . you've got a perfectly good AR, and you want to put what on it??!!
if they weren't 1200 clams I might buy one just to get into bow hunting.
You might want to check with your local wildlife department and/or AG as to whether or not it would be considered a firearm since the lower is actually considered to be a firearm by law. As such, you may not be able to use it during bow season.
The only way I would get one of those is if it was self loading with a magazine of 20 bolts!
if they weren't 1200 clams I might buy one just to get into bow hunting.