(#1)- Rifle-length gas system. (#2) - No, this rifle has a Commercial non-retractable Buffer Tube. (#3) - This rifle has a 18" (black) Teflon-coated MK-12 stainless steel heavy barrel, chambered in 5.56 NATO with a 1x8 twist and finished with the muzzle stabilizing Miculek Compensator and is magnetic-particle tested. *****Complete Specifications per DPMS***** DPMS Panther 3G1 semi-automatic rifle RFA3-3G1 - 5.56mm NATO (accepts .223 Remington) - 18" heavy barrel with Miculek compensator - 6 grooves, 1x8 RH twist - 30 round capacity - Gas-operated, rotating bolt - Magpul CTR collapsible stock - Upgraded pistol grip - A3 flattop forged 7075-T6 aircraft aluminum alloy upper receiver - Hard-coat anodized per MIL-SPEC and Teflon coated black upper - Dust cover - Shell deflector - Round forward assist - Right hand ejection - Forged 7075-T6 aircraft aluminum alloy lower receiver - Hard-coat anodized per MIL-SPEC and Teflon coated black lower - JP adjustable trigger - Aluminum magazine release button - VTAC modular free float tube handguard - 416 stainless steel barrel, Teflon-coated black - 8620 steel bolt carrier, heat-treated and plated per MIL-SPEC - Phosphated steel bolt, heat-treated and plated per MIL-SPEC - Overall length 35" collapsed / 39" extended - Overall Weight 7.75 pounds unloaded - Black.

it has a Commercial non-retractable Buffer full-length gas system Its mil-spec certified 4140 chrome-moly vanadium steel 18" barrel is magnetic-particle tested. The 3G1 has a phosphated steel bolt and 8620 steel bolt carrier, both heat-treated and plated per Mil-Spec.

#1 - full-length gas system #2 - No, it's a Commercial non-retractable Buffer Tube #3 - Its mil-spec certified 4140 chrome-moly vanadium steel 18" barrel is magnetic-particle tested. The 3G1 has a phosphated steel bolt and 8620 steel bolt carrier, both heat-treated and plated per Mil-Spec. This is all the info I could find on this.