If getting onto tight spaces with the full power of a 1/2″ impact is what you are after, look no further. The Chicago Pneumatic CP7732 ($139) packs a lot of punch into a very compact design. At only 4.4” width CP really did a nice job of sliming the tool down but with 450 ft lbs in reverse it still gets the job done. The controls for power and direction are right in the trigger and are a true 1 handed operation which you could easily change even if you already had the gun in a tight space.
This impact has been on the market only a short time but so far the reviews have been outstanding. Folks are switching away from the extremely popular CP 7733 ($139) & IR 231HA ($139) impacts and going for this lightweight but similarly priced unit. While the torque is a little lower for many applications it is a better option and seems to be holding up better than these other tools in the shop.
For any question on professional air tools give the pros at Ohio Power Tool a call 800-242-4424. OPT was originally started as a pneumatic repair shop, a service still offered today, simply put these guys know their air tools. They also stock a full range of CP & IR parts and tune up kits you can order, see the parts breakdown page for more info if you want to do the work yourself.
