I have a We G18c with one extended and two regular mags. I have not fielded it but was told that it expels some gas on the first shot of full auto. Some times you have to press the mag catch for it to catch or really press the mag up. I will include a bottle of about 2700 .25bbs. I do Haagen a shooting video as well. I also have a sightmark 5x magnifier for 40.