Need infos on where to start to change hop-up rubber on the G&P Baby Monster
 

I recently bought this awesome little beast : the G&P Baby Monster

http://shop.ehobbyasia.com/gandp-baby-monster.html

The hop-up does not seem to be very good so I would like to change the rubber and check everything.

I am wondering where should I start to open this thing and reach the hop-up. I want to disassemble it as little as possible.

Do I look for videos for a regular M4 (since it'a basically a short M4) or should I do it differently?

Thanks!

Pop/unscrew the front receiver pin (G&P sometimes uses a split pin with a hex screw, or a full pin which pops out).

Pull the charging handle back a little, and slide the whole upper receiver forward and off of the gun. Take note that there might be wiring running from the lower receiver to the upper receiver for battery placement in the hand guard or on the rails.

Look in the upper receiver and pull the hop up unit out. Now it should break down like a regular V2 hop up.

Thanks for the quick answer ShelledPants but I have no idea where the front receiver pin is located. Total newb with M4 (I never even fired one!).

Based on the pics on the ehobbyasia website, where should I look for it?

It's an M4 variant. Google for disassembly/hop-up replacement videos for G&P M4's. Run wildcard searches until you find something that fits your needs.

Or you can just dive right in and start an orderly disassembly. Just keep track of parts, orientation, where things go, etc.

But I'd start with looking for a video.

Bring to my place if you are willing, I can help you on that. I probably have some guarder hop up rubber or nub somewhere. Keep in mind, I don't speak French.

It's the large pin in the front where it looks like it should "pivot". There's only two of them and you can't miss them. They're two large pins that look like this: http://www.justairsoft.com/store/532...-body-pins.jpg This is the rear pin http://www.ironfoot.co.uk/forums/dow...le.php?id=3882 DO NOT REMOVE THE REAR PIN (it's unnecessary work). All you need to do is remove the front pin to separate the upper from the lower.

Also DO NOT pull the charging handle too hard, I've borked a charging handle spring by pulling too hard..... After that remove the hop up assy (hop up, with bucking inside, and the barrel).

It will look like the following picture except really short barrel. http://www.evike.com/images/large/Ho...M49_360_lg.jpg

As for upgrades, all you really need is a Guarder Clear (I assume this is a CQB setup?) if not then go Guarder Black for 370+ FPS setups. Either that or Prommy purple, or SystemA, or whatever. I personally run a SystemA in my G&P M4. Also, the stock G&P barrels are alright so I wouldn't change that out unless you wanted to cover the extra length of a new inner barrel with a silencer I don't think they make such short inner barrels (The lowest I've seen readily available is 200mm).

Also there's this Guarder 6.04 141mm barrel which IMO is pretty good. http://shop.ehobbyasia.com/upgrade-p...gth-141mm.html I personally run a 363mm Guarder 6.02.

Front pin in red. It's so simple it hurts. Knock that out and slide the upper off, then you'll have access to the hop unit and inner barrel:

http://i62.photobucket.com/albums/h1...Untitled-4.jpg