Building My Gun.

The grip and drop are pretty much purely cosmetic as far as upgrades go. I'd think you'd get better bang for your buck if you invested that money into upgrading the cyclone so that you get a reliable feed rate out of it with the R/T. The R/T and J&J Combo is a go though. Nice choices there.

I believe TechT makes a mod called the "vortex mod" it replaces the stock plastic piston and ratchet in the cyclone feeder with aluminum parts (meaning less chance of the ratchet breaking) used in conjunction with the "lightening rod" that TechT makes, you can achieve faster cycles with the cyclone. It will also lower the operating pressure of the cyclone so you don't wind up having to manually feed rounds when you get low on air. They also make a QEPH (Quick Exhaust Piston Housing) that will allow the cyclone to operate at even low and faster speeds than with just the vortex and lightening mods.

Here is a link to the items mentioned above over on PBreview.com Linkey-goodness!

You also need a "Grip Adapter Block" for the drop forward if you buy it. Not sure if you knew that

 

To piggy back on ssok's post. Shocktech makes drop forwards for the A-5 that put the ASA in the perfect spot so you don't have to worry about switching out the stock gas-line for a new one. They come with the adapter built into the system.

They're all drop-in/bolt-on mods. If you have a set of allen keys, a screwdriver, and can read, you're all set!

QEPH can be put on at any time. The Vortex mod needs to come before the lightening rod though, or at the same time.