Hi if you have a Airforce airgun .177 or .22 and wish you could carry pellets you can. With the Air Venturi pellet pen. Glue one to each side of AF gun under the breech. Cut off some of the pen end and some of the push rod to slim down and easier to pull rod out to refill, paint (if you want) and your done. Always have pellets with your gun and easily with out taking either hand off either grip reload. Hope this help I do it to all single action or brake barrel guns.