I just finished my first build, everything is working but now I'm just fine tuning it to reduce the recoil. I hear getting a Spike Tactical heavy buffer will eliminate most of the recoil, but which buffer should I get? I also have a SilencerCo Saker on pre-order which I'll be running dedicated whenever pigs luge. Will a suppressor factor in when I run it dedicated in the near future? Here is what Spike's offer: ST-T1 (3.0oz), ST-T2 (4.05oz), and ST-T3 (5.4oz)

Current setup:

Mega Mono Upper/Lower
Mega 4.5lbs single stage
Adam Arms Mid-Length piston
PRI-MSTN muzzle break
WOA 18' SPR mid barrel
Magpul UBR
Danial Defense spring and heavy buffer
*pre-ordered SilencerCo Saker

http://img.photobucket.com/albums/v107/monkeykevin/Firearms/IMG_20120310_190632.jpg

My $0.02 on the T2...

Any problems with a ST-T2 in a carbine length 14.5 barrel or is it GTG?

I've had problems with the T2 in a midlength using .223. but you should be GTG in a carbine.

Off topic but....how do you like that Mega Trigger? I was thinking about one for my Mega Lower build (waiting to receive parts is killing me) Since no one else has said it yet....that is one sick rifle, I love Mega

Here is something to consider about the spikes buffers.  If you read the descriptions, the T1 and T2 have some sort of tungsten powder where the T3 uses Tungsten barstock weights.

Now I haven't taken my T3 apart yet, but from what I have read on other makers T1 and T2 buffers (probably called H1 and H2) is they use 3 weights and a H1 has one tungsten weight, H2 has Two, and T3 is listed as having 3 tungsten weights.  

So going with the assumption that a standard milspec buffer will have 3 steel weights and taking the chance the T3 buffer has the same size tungsten weights, I can do the following if I already own a milspec buffer.

Shoot a T3
Open it up and swap a steel weight for a tungsten weight and make effectively a H2
Open it up and swap again to make a H1.

So for my old milspec buffer and a T3 from spikes, I can play with all 3 buffer weights not including the factory buffer.

I bought a T3 and have an option to modify it to any of the heavier buffers to try in my rifle.