Case gauge the ammo first. Case gauge before you do anything else. Small base dies doesn't mean its right check it. Or spent a bunch of time and money changing things. CASE GAUGE.
Whiskey arms
I have 4 of em they are great . 2 in guns of mine, 2 in guns of my wife's . Thousands of rounds on all of em.
https://whiskeyarms.com/products/lbc
Use the new pmags and forget about base pads.
buy 3 mag for same price as one TF or one TT pad.
http://www.primaryarms.com/mpi-pmag-gl9-9mm-21rd-mag661
My vote for them is hell no don't like em. The thing is it will probably catch on. They have already changed division names for no reason. Tactical to Practical Open to unlimited etc/ that sucked to.
Nordic 15" under 100.00
http://www.midwayusa.com/product/2545182639/nordic-components-slotted-customizable-free-float-tube-handguard-ar-15-aluminum-black?cm_vc=ProductFinding
When this first posted the recover set pictured above was 450.00 when i first looked. Later that day it went to 525.00, 75.00 jump in a day
http://f-1firearms.com/bdr-15-3gupper-lower-set/
I run a Warne seems to provide more clearance than most. Very well made. I run a Burris fast fire and have had no problems with it.
http://www.midwayusa.com/product/1592122630/warne-45-degree-offset-picatinny-side-mount-adapter-aluminum?cm_vc=ProductFinding