HK Army Alpha Air 77ci 4500psi Carbon Fiber Tank Bottle Only

The HK Army Alpha Air 77ci sits right in the middle of HK Army's five-size carbon fiber lineup, giving you extra air capacity over the 68ci without stepping up to the bulkier 88ci or 98ci bottles. Built with the same carbon fiber wrap and 4500psi rating as the rest of the Alpha Air line, it's designed for players who want more shots between fills without adding much size or weight. At 9in long and weighing in at 1lb 12oz (0.9kg), the 77ci is only a few ounces heavier and less than an inch longer than the 68ci, while keeping the same 4.4in diameter — so it delivers noticeably more air capacity without changing how the tank fits in your hand or your tank cover. Like the rest of the Alpha Air line, it's available in a wide range of color finishes. HK Army Alpha 77ci Air Key Features The middle capacity in HK Army's five-size Alpha Air lineup (48ci–98ci) 77ci capacity, rated to a 4500psi fill for more shots between fills Same 4.4in diameter as the 68ci, so most tank covers carry over Full carbon fiber wrap keeps the bottle light despite the added capacity Compatible with HK Army Standard, MP5, HP8, and Turbine Pro regulators, plus Ninja, Immortal Air, and Empire Bottle only — pair with a regulator you already own, or build a complete system with our Alpha Air Tank Builder 77ci Specifications (Bottle Only) Capacity 77ci Working Pressure 4500 psi Diameter 4.4in / 112mm Length 9in / 228mm Weight 1lb 12oz / 0.9kg Universal Regulator Compatibility This is a bottle-only listing — no regulator is included. Like every bottle in the Alpha Air line, the 77ci uses a standard tank valve thread, so HK Army's Standard, MP5, HP8, and Turbine Pro regulators all thread on directly, along with regulators from other major brands such as Ninja, Immortal Air, and Empire. Build a Complete Air System Need a regulator too? Use our Alpha Air Tank Builder to pair this 77ci bottle with the regulator of your choice and check out as one complete, ready-to-fill air system. Also Available In The Alpha Air carbon fiber tank comes in five capacities — 48ci, 68ci, 77ci, 88ci, and 98ci — with the 77ci landing right in the middle of the lineup. This listing is for the 77ci bottle only. Frequently Asked Questions Does the Alpha Air 77ci come with a regulator? No. This is a bottle-only listing for the 77ci carbon fiber tank. HK Army's Standard, MP5, HP8, and Turbine Pro regulators will all thread directly onto this bottle, along with regulators from Ninja, Immortal Air, and Empire — or use our Tank Builder to select a bottle and regulator together as one complete system. Will any regulator fit the Alpha Air 77ci? Yes. The 77ci uses the same standard tank valve thread as the rest of the Alpha Air line, so HK Army's Standard, MP5, HP8, and Turbine Pro regulators fit directly, as do regulators from Ninja, Immortal Air, and Empire. How does the 77ci compare to the 68ci? The 77ci holds about 13% more air than the 68ci while adding less than an inch of length (9in vs 8.2in) and roughly 3oz of weight (1lb 12oz vs 1lb 8.6oz). If you want more shots per fill and don't mind a slightly longer bottle, the 77ci is the next step up. Is the 77ci as light as HK Army's other carbon fiber tanks? The 77ci is built using the same lightweight carbon fiber construction that makes the Alpha Air line HK Army's lightest carbon fiber tanks to date. A larger 77ci bottle naturally weighs a bit more than the smaller 68ci or 48ci, but it uses the same weight-saving carbon fiber wrap across the entire lineup. Will a tank cover that fits the 68ci also fit the 77ci? The 77ci keeps the same 4.4in diameter as the 68ci, so most tank covers and pouches sized for that diameter will still work — just double-check the length, since the 77ci is about 0.8in longer at 9in overall. How often does a carbon fiber air tank need to be retested? Yes — this is a composite (carbon fiber) tank, and DOT/TC rules require a hydrostatic retest every five years from the manufacture date to keep it certified for fills. The exact retest date is stamped on the bottle itself.