I am currently working on a Handheld High Powered Pneumatic Scrap Accelerator Cannon (HHPPSAC) Or just Spike Rifle for short. It will launch railway spikes at high power and deliver a heavy blow of damage to enemies. It has It's advantages and disadvantages.
Pros---------------------------------------------------------------------------High Powered -
EXTREMELY high damage.
Pump action - control over weapon power.
Cons---------------------------------------------------------------------------------------------Bulky - Heavy and massive kickback
Inaccurate - the weapon is bulky and difficult to steady, accuracy is a fairly wide cone (Unless fully pumped)
Slow - weapon must be pumped six times for maximum effect.
Low clip size - 3 shots per clip, reload time is moderate.