It was during a promotion, which i've seen come up again since I had mine done. $49.99 ea for E2 and SRT mods.
There is an SRT kid on gunbroker now with a starting bid of $80 - I have not yet seen the E2 parts available for separate purchase.
Glock 19 G4 | Glock 21 G4 | S&W M&P 9 Pro | S&W M&P 22 | Sig P220 Elite Dark | Sig P226 MK25 | HK P30L | HK45 | HK USP 9 | HK USP Compact 9 | HK USP 45 TACTICAL
Daniel Defense DDM4 V4 | Arsenal SGL 21 | ASA SBR w/ Side Charger | Savage Mark II FV-SR
Mossberg 590A1 20" SP | Mossberg 500 Cruiser