So the stock I'll just try to modify it with tape. And for the grease idk like it looks like it might be line and I don't wanna have to fully take apart the gun of I have to. Every time I put a mag in like the top of it has grease/lube On on

theres probably too much grease then. But I still recommend changing out the grease incase they used grease or oil of a bad type.

you purchased a GBB. You will have to take it apart. Get familiar with that. Get used to that. If you don't you'll find one day your gun won't perform. GBBRs are not AEGs and should be lubed like a normal firearm. I.E. with some frequency.

Okay I'm gonna take it apart I bought a airsoft innovation propane adapter kit and it came with silicon can I use that as grease? And how long do you recommend I hold the propane tank into the mag.

Silicon oil is not grease.

What kind of grease do you think I can use that I probable already have at my house?

Vaseline.

QUOTED FOR TRUTH

Okay theres about a dozen thread on grease and what people use. Basically use what every you want as long as its safe on plastics/rubber. So Froglube from a firearms store is amazing, but theres other options.

Silicone oil is too light weight and will get 'blown off' during firing.

As for how long, you should turn the mag upside down and press the tip of the cannister down into the fill valve, none should spray back out at you/out the sides. Hold it as vertical as you can, wait till it sounds like the gas is no longer going into the mag. You'll notice it trust me.

Is there any good videos or websites to tell me how to clean and take apart my smg8 throughly I've only seen one and his English easnt good and it was old

Thanks!

This will do in a pinch and only because you asked "what you had around the house". Be careful that Vaseline (petroleum jelly) is a mixture of hydrocarbons/solvents known to attack orings/gaskets and may be a problem with plastic gears. On metal gears there may be problems with use when thinner sections evaporate leaving a waxy deposit.

Son I shouldn't use it or just a thin coat on only metals? And just clean it often.

when you get a chance, go to a hardware store/crappy tire. Now buy a lubricant or grease that is safe for using on plastics/rubber.

Or go to a hobby shop and get RC shock oil

Or go to CTC Supplies.com and get froglube paste when they get it back in stock.

I'll do the rc shock oil I gotta go to the hobby shop anyway to fix a plane I got thanks for all the suggestions guys!

Okay so I finally got to shoot this thing and I am having a lot of problems can you guys help me to get this thing to shoot better.
Problem 1. Stock keeps collapsing when only a little amount of pressure is applied

Problem 2. The charging handle pulls the bolt back and it only stays about 10 percent of the time.

Problem 3. If can't fully empty a mag it runs out of gas before it goes through all the bbs.

Problem 4. The mags are not feeding well they are getting stuck and not pushing the bbs up (i think it's because I'm using crappy bbs and I just need to clean the mag)

Problem 5. Its just not accurate I havnt really got a full clip off but it's not accurate or consistent. (might also be the bb)

Problem 6. Final problem is my auto doesnt fully work it's like the bolt isn't going back far enough to cycle another bb.

Thanks for the help!