Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Senco Framing Nailer

Senco makes a lot of great nail guns... This is NOT one of them. They should name this gun jamco, because thats what it does, jams! Problem--the tension spring that pushes the nails up is not strong enough so the driver often comes down with the nail not all the way in place. Result--Jam. And often, the nails get so jammed in there that you have to take the magazine off to unjam it (10 minutes). There is nothing worse than prying jammed nails out of a brand new nail gun with a screwdriver! Even using Senco nails, you're lucky to go through 4 strips without a jam! I recently replaced mine with the Hitachi NR83a, (available here for same price), its lighter, smaller, just as powerful, and NEVER jams! (wont shoot 16d commons unless you replace magazine with aftermarket).