Question about this old airsoft gun

I bought this airsoft gun in 2010 and have no idea what it is. I’m guessing it’s a JG of some sort but I’m not sure. I see it labeled as M733 on the manual and W733 on that piece of paper that tells you how the folding stock works. It originally had a folding stock. It broke off so I ordered a replacement here: https://www.airsoftmaster.com/jg-side-folding-stock/. It also originally came with an orange muzzle cover and cleaning rod. Someone just sold me that battery as the original was dead. I feel like it shot tighter groups, shot a little further, and was a little more powerful. Can anyone tell me what model this is? I was also wondering if I could upgrade it to shoot how it did originally. I want to restore it for nostalgic purposes.

I bought this airsoft gun in 2010 and have no idea what it is. I’m guessing it’s a JG of some sort but I’m not sure. I see it labeled as M733 on the manual and W733 on that piece of paper that tells you how the folding stock works. It originally had a folding stock. It broke off so I ordered a replacement here: https://www.airsoftmaster.com/jg-side-folding-stock/. It also originally came with an orange muzzle cover and cleaning rod. Someone just sold me that battery as the original was dead. I feel like it shot tighter groups, shot a little further, and was a little more powerful. Can anyone tell me what model this is? I was also wondering if I could upgrade it to shoot how it did originally. I want to restore it for nostalgic purposes.