• San Tan Tactical PILLAR® truss pockets for increased structural rigidity
  • Machined in T markings for easy optic relocation
  • Forward assist has been removed from upper to reduce weight
  • Machined with M4 feed ramps

*Does not include port door assembly


  • Material: Billet 7075-T6 Aluminum
  • Finish: Type III Hardcoat Anodized
  • Weight: 7.02 oz.


  • AR-15 lower receiver


So you want to shoot for an ultra-light, super-fast AR build and have your cake too. Well, up till now that could have been only a dream. Fortunately, San Tan Tactical will help you make it a reality. When you start your ultra-light build with a San Tan Tactical Pillar Light Upper, the rest of the equation can fall into place.

Getting Less Gives You More

When you want to go for a slick, lean, mean AR-15 the obvious starting point is a San Tan STT-15 Pillar Lite Billet upper receiver. Scale that build back to what you really have to have and ditch all the rest. You want to keep that AR as light and as on point as possible without all the extra meat where it does no good, an STT-15 Pillar Lite Billet upper is the starting point. This is the point where a San Tan Tactical Pillar Lite Upper comes into play. If you select the right components, work becomes play.

Ring The Bells, Blow The Whistles And Shoot The Gun

The important things are on the inside. This is true in a marriage, house, car or a weapon. You know what lives inside your AR. The specifics are inside your STT-15 Pillar Lite Billet upper, and you know how to put them into motion. You know, the things that matter when push comes to shove. Those M4 feed ramps are going to feed flawlessly, and the BCG is going to cycle every time while you reap the rewards of good choices. You simply need to step it up, get a San Tan Tactical Pillar Lite Upper receiver, build it out, own it and let it run.

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