Hello Hans, I appreciate your feedback on the TR150HL SharpShooter Heavy Duty Staple Gun and I'm sorry to hear it was misfiring. This is not the kind of performance we expect from our products and would like to speak to you about this issue so we can assist you in resolving this to your satisfaction. Please contact support at WECARE@sbdinc.com and reference ticket # 6651493 so we have all information available from your review.
Thanks, Roxy STANLEY Social Media Team