Easy
15-30 minutes
This is a genuine manufacturer sourced replacement part. It is commonly utilized on Bostitch nailers. The piston bumper will keep the piston from hitting the bottom of the cylinder and damaging it. Because this item is constantly under pressure, it will eventually crack and fall apart requiring replacement. This item is made out of plastic material and it is sold individually.
Bumper 191777
OEM part for: Bostitch, DeWALT, Porter Cable
Part Number: 191777
$19.08
In Stock
Ships within 1 business day 
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Compatibility
This part will fit the following 10 machines
Bostitch
RN46 Coil-Fed Pneumatic Roofing Nailer View Diagrams & Manuals
RN46-1 Coil-Fed Pneumatic Roofing Nailer View Diagrams & Manuals
SF150C (Type 0) 1-1/2 X15 Degree Coil Nai View Diagrams & Manuals
BRN175A (Type 1) Shell 15 Degree Coil Roof Power Tool View Diagrams & Manuals
RN46-1 (133450000 and up) Roofing Nailer - C.T Power Tool View Diagrams & Manuals
RN46-1 (17270000 and higher) Roofing Nailer - C.T Power Tool View Diagrams & Manuals
RN46-1 (Type 0) Roofing Nailer - C.T Power Tool View Diagrams & Manuals
DeWALT
DW45RN (Type 0) Roof Nail 3/4-1-3/4 View Diagrams & Manuals
DW45RN (20057001 and Higher) Roof Nail 3/4-1-3/4 Power Tool View Diagrams & Manuals
Porter Cable
RN175C (Type 1) 15 Deg Coil Rf Nail Power Tool View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Nailer Parts
This part replaces obsolete part #: 149803
Repair Videos ?
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Bumper
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Worked as expected
Received my order quick.
Guest -
August 13, 2023
Verified Purchase
Rebuilt my nailer
It came ,it fit and works great ,bought other rebuild parts also and my nailer works great
Guest -
June 19, 2019
Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
broken bumper
Marc - April 15, 2022
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Wrench Set, 5mm allen wrench
Parts Used
removed head off nail gun. removed sleeve and piston out. removed bumper. clean inside of nail gun. reinstall bumper, sleeve and piston.
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O rings were bad
Richard - January 21, 2022
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Power Drill
Used a cordless drill to take the screws out and replaced the bad o rings
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Bumper crack and oring broken
Luis - April 5, 2020
Tool Type
Nailer
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Power Drill
Parts Used
Everything good and easy
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O-ring broke and bumper completely shattered
Allen - January 15, 2020
Tool Type
Nailer
Difficulty
Medium
Time
15-30 minutes
Tools Used
, Allen wrench
Parts Used
1. Removed the 4 screws that hold the back cap on.
2 pulled out the driver/piston
3. Used compress air to clean out all the debris from the shattered bumper.
4. Installed new parts. O-ring, bumper, guide
5. Used air tool oil to lube up new parts
6. Reassembled the back cap using the 4 Allen screws
7. Tested nailer and works perfectly.
2 pulled out the driver/piston
3. Used compress air to clean out all the debris from the shattered bumper.
4. Installed new parts. O-ring, bumper, guide
5. Used air tool oil to lube up new parts
6. Reassembled the back cap using the 4 Allen screws
7. Tested nailer and works perfectly.
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Worn bumper and o-ring
Ronald - August 28, 2016
👍 0 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrench and punch
Parts Used
Removed head
Punched out piston from the bottom
Cleaned out cylinder
Installed new parts
Punched out piston from the bottom
Cleaned out cylinder
Installed new parts
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Broken o ring on driver head and broken bumper
Ralph - July 21, 2016
👍 0 of 1 people found this instruction helpful
Tool Type
Nailer
Difficulty
Easy
Time
15-30 minutes
Tools Used
, Allen wrenches
Parts Used
Remove the Allen wrench bolts and remove the head. Pull out all the parts and replace all the o-rings and the bumper. Then put it back together in reverse
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Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
