Well first of all repeater would be best and second their is no gyrojet in runescape.

Produced by M.B.A. of San Ramon California from 1960 to 1969, the Gyrojet saw only limited production. The Blue Book of Gun Values lists these guns at under $1,000.00 but it is very difficult to find enven the most common used models for less than $1500.00. Unfired guns, presentation models, and rare variations can top $5,000.00 and Gyrojet ammo can fetch $100 per round. http://www.littlegun.be/arme%20americaine/a%20gyrojet%20gb.htm

In the 1960's there was the Gyrojet gun which were actually miniature rockets but the caliber was larger than the .223 round of the M16

they were unreliable and inaccurate when they did work possibly tacking a 90 degree turn (over exaggerating but u get the point)

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Agree- and the ammunition was incredibly expensive- in 1963, it was $6 per shot-

Are you shooting it while in space or from outside space to inside space? Well the bullet wouldn't stop until it hit a gravitational pull and it would get drawn in. You would also get blown back by the force.

Very few firearms would fire in the vacuum of space. Oxygen is necessary for ignition, and bullets are not sealed; any oxygen contained within the cartridge is likely to leak out with exposure to the vacuum.

The US did develop one family of firearms that would fire in vacuum, the Gyrojet. Gyrojets were built in different calibers and configurations. There were pistols and rifles. Essentially, the Gyrojet fired a small rocket with a gas propellant, that ignited within 30 feet of the barrel. There was very little if any recoil, and the effective range was greater that a conventional powder round.