Board Thread:General Nerf discussion/@comment-30157565-20160320164746/@comment-27306930-20160321145239

Ok, when you removed your dart posts, was the back of the cylinder smooth and flat. Is the foam gasket on the end of the plunger tube still intact ? The StrongArm advances its barrel AFTER the shot, while the plunger is still in contact with the cylinder. So if the backside of the cylinder isn't super smooth it'll tear up the foam seal and then the air will leak out the sides. Check your gasket and get back to me.