Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: Can you adjust for bb drop or hop up to make it more accurate and if so how? Is 6mm 20gram bb's recommended for this gun?
Document: This is my first Co2 pistol and as a newbie I would like to say I am happy with it, it comes in all metal (a big step up from spring), it has a 15 bb mag and a quick release for the mag as most do. I used 12 gram Co2 cartridges and they are fine, although the recommendedbb's are 6mm .20g's I used 6mm .12g' and they still shoot, but do to the lower weight of the bb's I use they don't go as far as .20g's.
this gun does not have any hop up built into it. If your very close it shoots pretty good but with out any hop up your bb drops fast at like 20-30ft. i took mine apart to see what this so calld hop up unit was and there is nothing in the barrel. when I bought this the description says hop up  yes. well I'm here to say hop up  NO. save up for a better adj hop up gas gun. trust me
do not buy this item description is incorrect. There is no hop up adjustment. This gun has a fixed hop. Do not buy this. It doesn't have what it says it has. Do not buy. Description of this gun is wrong. Trust me. I contacted customer service and everything and they didn't find the hop up. And all YouTube videos of it said that there was a fixed hop. Meaning you can not adjust it. Do not buy this gun.
That lubricates the whole gun and keeps the CO2 from leaking out.In my backyard I can see the white bbs as they go down range. I'm not sure what hop up is supposed to look like but my gun is very flat shooting and accurate out to 30 or 40 yards. A few of the bbs curve to the side at @ 25 - 30 yds down range (ambient wind maybe? ); but I've been plinking tree's out the 40 yd mark and hit 7 out of 10 shots.
Received pistol on time. Came with small package of rounds, no CO2, but that was explained in product description. Has decent weight to pistol. Shoots decently hard. Had my son shoot at me from about 30 feet, has a good sting. No hop up adjustment on this model. This is my first airsoft pistol, but it won't be the last. This one is good or the price, considering it's about half of what a Tokyo Mauri model will cost. All in all, I'm satisfied.
Although i only have 1, this would make a very good akimbo weapon, you could probably use 2 as a primary weapon. I would recommend it to anybody for any use.
So far this thing works perfectly. As far as leaks go, none to report. I've left a cartridge in it for months at a time and it lost little to no pressure at all. Highly recommended.
Definitely a little over 350fps with .20g.Overall build is pretty good. Fairly solid (not very many audible moving parts), just remember this is a blowback. It does have more moving parts than most airsoftpistols. Nice weight, feels very realistc. I needed this gun for occassional airsoft battles and for movies due to it's realistic look and blowback.Recommended.
This is a well made and every sturdy gun.The blowback is strong and it is accurate.One drawback of this gun us that the co2 doesn't last every long but you can use it a couple of magazines first.I would  say this is a great gun and mine has lasted 5 months with no issues.
This gun is accurate even in my inexperienced hands. If I get further  involved with the Airsoft game (a dealer is opening a game space in the next town) because of my experience with this gun I will be looking at Umarex equipment first.=============As of this date I've put about 2000 rounds through the gun and burned through a lot of paper targets.
Answer: yes