Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Jams constantly

Extremely disappointing. Bought this based on the positive reviews, but it jams constantly on 1 5/8" Bostitch brads! I unfortunately didn't get the opportunity to use the nailer before the Amazon return policy lapsed, so now I have to get warranty repair on a brand new, defective tool. Never buying Hitachi again.