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If you are into small arms history, you must have heard of SPR (Special Purpose Rifle.) The SPR, used by Special Operations Forces of both the U.S. Army and U.S. Navy, is a heavily modified light sniper/designated marksman variation of the AR-15/M16 line of infantry weapons, and is chambered for NATO standard 5.56x45mm ammunition. The first SPR adopted famous PRI Gen I and Gen II carbon-fiber free-float handguard. One very important feature of PRI handguard is its carbon fiber main body. The carbon fiber can stop heat transfer from barrel to the handguard.

Ultimate PX-04 Lipo: 11.1V, 1000mAh, 12Wh, 15C. Dimension: 104x8.75x6.25 mm
Fit to : STOCK-FIT EDITION ! Special design for M4 buffer tube. Perfectly fit into M4 buffer tube!
Full Stock ( M4/16, AK, M14 , MP5 ) ; Handguard ( G36 ) and where ever a large battery can fit it will fit.

Ultimate PX-03 Lipo: 11.1V, 1300mAh, 15Wh, 15C Small tri-panels. Dimension: 109.30x20.50x7.37mmx3pcs
Fit to : All solid stock models ( M4/16, AK, M14, MP5 ) ; SCAR stoc, PEQ box, AUG (Phantom) series, M249 series, M14 RIS,Shoyld fit in most crane stocks, but modification might be needed.

Ultimate PX-02 Lipo: 11.1V, 1500mAh, 17Wh, 15C, Tri Panel
Dimension: 97.76x34.40x5.0mm x3 pcs
Specially M4/16 "handguard rail"; full stock (M4/16, AK, M14, MP5,MKII ) ; Handguard ( G36 ) and where ever a large battery can
fit it will fit.

This is a professional Classic Aluminum Popper designed for the US Practical Shooting Association.