The Mangler, the Crusher, the Shredder, there are a large variety of names given to scrapping and recycling robots. The Mangler, OCP's PM-9900 'Praying Mantis' is a very typical recycling robot. It was designed to handle refuse and to scrap damaged and discarded robots, androids and mechanoids. The original civilian model is equipped with large pincers and several cutting lasers and saws for dismembering robots to salvage their specific valuable components and separate them from the parts that can be sent to smelting. 

Like the LoaderBot, the Praying Mantis was given it's own military version. Rather than a stand and deliver sort of bot, it is generally equipped with camouflage and improved armor and sent out as a stalker. The machine is rather clever once given a predatory iOS upgrade and will ambush it's intended victims, seeking to immobilize and then quickly remove the head/cranium with it's cutting laser or saws.  Given the relatively high cost of the Praying Mantis and other recycling bots, few are used in this headhunter fashion.

Several have achieved sentience, another reason the modification is seldomly done.

 The LJ-1A is a good representation of the universally common materials handling robot. It is roughly human shaped, and at 600 pounds, not outside human operating parameters. It was designed to handle heavy burdens with a degree of finesse for loading and unloading vehicles and handling materials inside factory modules and warehousing sectors. It is a very low end of robot tech machine, and has a very primitive cortex. 

None of these factors prevented the LJ-1A from being modified into a combat mechanoid. The body panels, made of commericial ferroplastic can be unbolted and removed, and replaced with composite armor panels made to fit the machine. The arms can be unbolted and 'gun arms' can be fitted onto the robot, to make it a walking gun turret. The resulting robot typically has a pair of infantry support weapons for arms, or twin barrel lighter weapons (or a mix such as an infantry support flamethrower and a double machine gun arm). It is an easy target, and requires constant direction by a human operator, effectively calling out attacks for the robot to target and engage with it's weapons. 

These are third and fourth line machines that only exist due to the number of loader bots in existence and that if pressed, a two man crew can strip an industrial model and rebuilt it into a combat model in 4 to 6 hours.

I agree with Dossta.  But you got it done,