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: is it blowback
Document: well i recieved my umarex makarov co2 bb gun and it is about the same weight and size as a real makarov pistol,it has decent power and i left a 1/2 cartridge of CO2 for 2 days and it still had co2 in it! all and all it was a good purchase,good price,and fast shipping,so i am very satisfied.
muy buena no le doy las 5estrellas porque elgatillo es un poco duro (talvez con el uso se suaviza)y es un poco dificil centrar el cartucho de c02 por lo demas buenisima la recomiendo la caja en laque viene esta muy bien hecha.
fast shiping full meatal plastic grips good speed  good to get rid of rodents .good replica and very cheap .reliable gun co2 efficent
and hit them reliably at 30 feet or so.Check your local laws and ordinances before engaging in this sort of practice. It's also not a bad idea to talk with your neighbors beforehand, as well.
Well, for that amount of money - still a good BBQ party shooter.After some time I was curios to disassemble the air valve to see if I can mod it. Anyways, if I would brake this cheap toy - that is fine, I already had enough fun with it. Drilled out a bigger holes in the valve piston so it passes through more air - seems like the power goes up, as it now makes deeper dents in metal test sheet, no leaks after reassembling.
We wanted to be sure it worked properly and did not have any problems. If for any reason it did not satisfy us during this test period, we were going to send it back and try something else. Instead we wished we did not have to send it to my dad because we enjoyed shooting it so much!
Very accurate, fits my hand well and looks like the real deal. Much better than I expected it to be.
Thought of drilling out the hole in the hammer and pour a  melted lead to make it heavier, but afraid it might crack the hammer. Anyways, I guess I have squeezed most power out of this little pistol, yet gain it works and shoots louder, now spitting a little white cloud of air, giving it even more realistic look. Then bought four more clips, so now it becomes even more entertaining. Would love to measure the velocity with chrony, but I'm not too big airgun hobbyist to buy one.
This thing is great. surprisingly accurate and functioning great after several hundred shots. Single / double action is realistic and impressive for a pistol in this price range. I would definitely recommend !
This is one great gun. It feels like an actual gun and is all metal except for the grip. The grip is still fine though. If you are doubting about getting this gun because of the other reviews, dont listen to them and get it.
Answer: no