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Posted: 3/24/2008 2:10:03 PM EDT
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I've heard a lot about the extractor upgrade kits that include a new spring, black insert, and o-ring. I've heard so much about them that I went out and bought one (for the price, why not?). I understand it aids in extraction. How? Why? What do each of the components do for extraction? My bolt had a blue insert in the extractor. How does this one differ from the black one? Thanks in advance. |
| The spring presses the extractor harder, so it holds on to the casing tighter. The insert doesn't do anything, originally it was used to visually identify if the bolt has a rifle spring or a carbine spring. Not really sure what the O-Ring does, but its supposed to help, so all my bolts have one... |
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I'm very satisfied with my BCM extractor upgrade kit which I'm just using the extra power 5 coil CS spring on my carbine gas system, it already have a black insert and I didn't use the O-ring for now but will add it later on when the spring gets weaker. In my opinion and experience the extra power extractor springs are not required on midlength and rifle gas systems but carbine gas systems requires them to function properly. On my midlength gas and rifle gas system rifles I only need the O-rings which is good enough. |
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And FYI, DSG has black inserts and high-temp blue o-rings ..................... DSG Arms |
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http://www.mcmaster.com/ O-Rings, Cordstock, and Accessories This product matches all of your selections. Part Number: 8333T116 $1.61 per Pack of 5 AS568A Dash Number 006 Type O-Ring O-Ring Type Standard Cross Section Shape Round Width 1/16" Actual Width .070" Inside Diameter 1/8" Actual Inside Diameter .114" Outside Diameter 1/4" Actual Outside Diameter .254" Material Fluorosilicone Durometer Hard Durometer Shore Shore A: 70 Temperature Range -75° to +400°F Color Blue Specifications Met American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) MIL Specification MIL-R-25988 SAE Specification SAE J200 ASTM Specification ASTM D2000 © 2008 McMaster-Carr Supply Company. All rights reserved. O-Rings, Cordstock, and Accessories 6 products match your selections AS568A Dash Number 006 Type O-Ring O-Ring Type Standard Cross Section Shape Round System of Measurement Inch Width 1/16" Inside Diameter 1/8" Outside Diameter 1/4" Specifications Met Military Specification (MIL) MIL Specification AS3578 | MIL-P-25732 | MIL-P-5315 | MIL-P-83461 | MIL-R-25988 | MIL-R-83248C Material — Material comparison chart Buna-N Good oil resistance. Viton Used in applications requiring chemical and oil resistance. Fluorosilicone Resists petroleum fluids. Durometer View catalog pages (6) Compare products (27) O-Rings, Cordstock, and Accessories 27 products match your selections AS568A Dash Number 006 Type O-Ring O-Ring Type Standard System of Measurement Inch Width 1/16" Inside Diameter 1/8" Outside Diameter 1/4" Cross Section Shape Round Square Quad Material — Material comparison chart Buna-N Good oil resistance. Viton Used in applications requiring chemical and oil resistance. Silicone Excellent ozone, weather, detergent, and salt water resistance. Good high and low temperature resistance. Neoprene Weather and ozone resistant. Compatible with Freon. PTFE Most versatile resistance: acids, alaklies, synthetic lubricants, hydrocarbons, detergents, alcohol, refrigerants, and ketones. EPDM (Ethylene Propylene) Water, steam, and weather resistant. Polyurethane Excellent resistance to abrasion and tearing. Kalrez® Perfluoroelastomer Combines the resilience and sealing force of an elastomer with similar excellent chemical and temperature resistance of PTFE. Fluorosilicone Resists petroleum fluids. Aflas Offers excellent chemical, heat, electrical, and oil resistance. Durometer Durometer is the international standard for measuring the hardness of rubber, plastic, and most nonmetallic materials. The hardness of a material is its resistance to surface penetration. Harder materials have more wear resistance, but they are also less flexible. Note that an object may fall within more than one scale. For example, a typical shoe heel is 95 Shore OO, 70 Shore A, and 22 Shore D durometer. Medium-Soft | Medium-Hard | Hard | Extra Hard Durometer Shore Shore A: 50 | Shore A: 65 | Shore A: 70 | Shore A: 75 | Shore A: 80 | Shore A: 90 | Shore D: 55 Temperature Select the level of low and high temperature resistance that best approximates your need. Before purchasing a product, verify that the Operating Temperature Range is suitable for your application. These selections are meant only as a general guide. Lowest Temperature Range -100° to -50°F -49° to 0°F +1° to +32°F Highest Temperature Range +150°F to +200°F +201°F to +250°F +251°F to +300°F +301°F to +400°F +401°F to +500°F +501°F to +600°F Color Black | Blue | Brown | Green | Red-Orange | White Specifications Met American Society for Testing and Materials (ASTM) | Food and Drug Administration (FDA) | Military Specification (MIL) | Society of Automotive Engineers (SAE) | Underwriters Laboratories (UL) | Not Rated These 27 products match your selections Material Durometer Durometer Shore Color Specifications Met Temperature Range Round Cross Section Buna-N Medium-Soft Shore A: 50 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -40° to +250°F 2418T112 $10.00 per Pack of 150 Buna-N Medium-Hard Shore A: 65 Black American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) -65° to +150°F 4464T116 10.50 per Pack of 100 Buna-N Medium-Hard Shore A: 65 Black Military Specification (MIL) -55° to +250°F 5018T116 22.50 per Pack of 100 Buna-N Hard Shore A: 70 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE), Underwriters Laboratories (UL) -35° to +250°F 1879T12 3.12 per Pack of 100 Buna-N Hard Shore A: 70 Green American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -40° to +300°F 1884T12 2.49 per Pack of 100 Buna-N Hard Shore A: 70 Black American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) -65° to +275°F 4679T116 10.50 per Pack of 100 Buna-N Hard Shore A: 70 Black Not Rated -35° to +250°F 9452K14 1.87 per Pack of 100 Buna-N Hard Shore A: 75 Black American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) -65° to +275°F 4198T116 10.50 per Pack of 100 Buna-N Extra Hard Shore A: 90 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -25° to +250°F 5308T115 2.15 per Pack of 100 Viton Hard Shore A: 75 Black American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) -15° to +400°F 1201T16 4.82 per Pack of 50 Viton Hard Shore A: 75 Black ___ -10° to +400°F 2857T112 3.23 per Pack of 5 Viton Hard Shore A: 75 Brown American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -15° to +400°F 5267T16 6.22 per Pack of 100 Viton Hard Shore A: 75 Black Not Rated -15° to +400°F 9464K11 5.22 per Pack of 100 Viton Extra Hard Shore A: 90 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) +5° to +390°F 8297T116 6.00 per Pack of 100 Silicone Hard Shore A: 70 Red-Orange Food and Drug Administration (FDA) -65° to +450°F 9396K11 5.19 per Pack of 100 Neoprene Hard Shore A: 70 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -65° to +275°F 94115K006 2.08 per Pack of 100 PTFE Extra Hard Shore D: 55 White Not Rated -100° to +500°F 9559K11 12.66 per Pack of 50 EPDM (Ethylene Propylene) Hard Shore A: 70 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -65° to +212°F 9557K457 3.71 per Pack of 100 Polyurethane Hard Shore A: 70 Black Not Rated -20° to +180°F 9558K11 6.86 per Pack of 10 Polyurethane Extra Hard Shore A: 90 Black Not Rated -60° to +212°F 9558K611 14.82 per Pack of 25 Kalrez® Perfluoroelastomer Hard Shore A: 75 Black Not Rated +27° to +527°F 1108T116 27.54 Each Kalrez® Perfluoroelastomer Hard Shore A: 75 Black Not Rated +32° to +600°F 9568K11 22.80 Each Fluorosilicone Hard Shore A: 70 Blue American Society for Testing and Materials (ASTM), Military Specification (MIL), Society of Automotive Engineers (SAE) -75° to +400°F 8333T116 1.61 per Pack of 5 Aflas Hard Shore A: 80 Black Not Rated +25° to +450°F 5240T11 7.97 per Pack of 25 Square Cross Section Buna-N Hard Shore A: 70 Black Not Rated -20° to +225°F 4061T111 $10.48 per Pack of 100 Quad Cross Section Buna-N Hard Shore A: 70 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -40° to +250°F 90025K123 $7.10 per Pack of 100 Viton Hard Shore A: 75 Black American Society for Testing and Materials (ASTM), Society of Automotive Engineers (SAE) -15° to +400°F 6540K116 $9.63 per Pack of 50  Save Some Money ! http://www.gunsprings.com/RifleShotgun/Colt_RsNF.html#AR |
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