Porter-Cable BN200SB instruction manual and user guide 18 Gauge Pneumatic Brad Nailer BN200SB204460873 It comes with instructions, all needed o-rings and lubricant. And I have to say it was pretty easy to do. I recently had a similar problem with my Porter Cable roofing gun. Welcome to Just Answer. Hey guys, My framing nail gun is about 12 years old. The gaskets failed on my Porter Cable pneumatic 18 gauge nail gun. Sorry to hear about your problem. The plunger which strikes the nail does not retract all that way and interferes with the next nail. Porter-Cable 18-Gauge Pneumatic Brad Nailer Kit Hardwood Floor Nail Gun Air Tool 5 out of 5 stars (49) 49 product ratings - Porter-Cable 18-Gauge Pneumatic Brad Nailer Kit Hardwood Floor Nail Gun Air Tool It sounds like an o-ring. PORTER-CABLE PIN138 23-Gauge 1-3/8-Inch Pin Nailer. Unlike the large nailiing guns PIN138 resolves the problem of splitting while fastening materials. I can remove the air supply and look down the barrel and see the plunger partly engaged and interfering with the next nail. One of the smallest nailers in the industry that is best suited for clamping actions or light fastening is PORTER-CABLE PIN138 23-Gauge 1-3/8 Inches Pin Nailer. I went on EBAY and found a complete Porter Cable o-ring overhaul kit for about $15.00. C. Porter Cable Pin Nailer Review 1.