T4A2E2 Lil Thumper 2
By ShadowFire
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I call it the T4A2E2 Lil Thumper.
The T you can figure it out, but it was two internal adjustments and 2 external enhancements away from the "prototype" set up (standard semi-auto only fire control group and a magpul pistol grip plus a USGI trigger guard so I could test fire the upper). Installed is the KAK Pistol buffer tube, the SB-15 pistol brace and the Spikes Tactical standard weight buffer.
The "adjustments" were the long awaited addition (Very long back order.) of the Spikes Tactical enhanced parts kit which includes an ambidextrous safety.
The "enhancements" are a Ergo pistol grip and the billet aluminum trigger guard that came with the kit from Spikes.
This 7.5 inch upper receiver, chambered for 5.56x45 NATO was made by Radical Firearms and I installed the UM5 linear compensator, Yankee Hill HK style flip up sights and a 5.56 Nickel Phosphate bolt and bolt carrier group.
I discovered Radical Firearms for myself after many positive reviews about reliability and affordability. Working with Radical Firearms on some questions I had about setting up my lower to work with their upper, they answered all questions and I can proudly say this baby pumps out rounds and begs for more. Definitely will keep this one for fun time. 
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