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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Firing pins for AR with large skirt
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<blockquote data-quote="cohunt" data-source="post: 1657070" data-attributes="member: 94491"><p>i see you posted on arfcom also, so I'll be the bearer of bad news</p><p></p><p>did you read the "colt ar-15 proprietary information" on brownells web site? you ordered the "large flange pin" you got the large flange pin---if you want the small flange you need a different part number</p><p>:</p><p><strong>Colt AR-15 firing pin types</strong></p><p></p><p>There are three firing pin configurations utilized on the Colt AR-15. The configuration used by a particular AR-15 will be determined by the vintage of the firearm or the caliber.</p><p></p><p>SP62805, Brownells #<a href="http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4829" target="_blank">160-304-003 </a>is the designated number for the 9mm blow back breechblock.</p><p></p><p>SP62294 Large Flange (NATO stock # 1005-00-0017-9547), Brownells #<a href="http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4828" target="_blank">160-304-002 </a>. This firing pin has a nominal flange diameter of .375" and is typically used with a shrouded bolt carrier. This firing pin is typically found on M16 selective fire variants.</p><p></p><p>The very early SP-1 series commercial sporter AR-15 manufactured until the 1966/1968 period utilized, according to Colt sources, a large diameter flange that is unique to itself (larger flange then 62294) . We do not have a source for this firing pin configuration at this time. The period 1966 through 1968 was a transitional period during which Colt did a running production change to incorporate the small flange firing pin and altered bolt carrier into the commercial AR-15 variations. </p><p></p><p>Please Note: The circa 1995 Colt Parts Book shows the SP62294 large flange firing pin as being used in all but two applications. This is in error. With exception of the early SP-1 sporter and the M16 variants as noted above, typical post 1966/68 sporters will utilize the SP63039 Small Flange firing pin.</p><p></p><p>SP63039 Small Flange, Brownell #<a href="http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4391" target="_blank">160-000-205 </a>. Flange diameter is nominal .343". This firing pin is used in conjunction with a unique bolt carrier and hammer. The bolt carrier features a shallow ramp cut at the rear of the hammer path and no shroud at the rear of the hole for the firing pin. The hammer has a notch on the upper front striking face. The design concept behind these parts was to create a system that would prevent the firearm from going full auto should the disconnector fail or be inadvertently forgotten during reassembly of a firearm. In such an instance the hammer will follow the ramp cut down the rear of the carrier. At this point, as the bolt carrier moves forward to strip a fresh cartridge from the magazine, the notch on the face of hammer will engage the flange of the firing pin and stop the forward movement of the bolt carrier.</p></blockquote><p></p>
[QUOTE="cohunt, post: 1657070, member: 94491"] i see you posted on arfcom also, so I'll be the bearer of bad news did you read the "colt ar-15 proprietary information" on brownells web site? you ordered the "large flange pin" you got the large flange pin---if you want the small flange you need a different part number : [B]Colt AR-15 firing pin types[/B] There are three firing pin configurations utilized on the Colt AR-15. The configuration used by a particular AR-15 will be determined by the vintage of the firearm or the caliber. SP62805, Brownells #[URL='http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4829']160-304-003 [/URL]is the designated number for the 9mm blow back breechblock. SP62294 Large Flange (NATO stock # 1005-00-0017-9547), Brownells #[URL='http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4828']160-304-002 [/URL]. This firing pin has a nominal flange diameter of .375" and is typically used with a shrouded bolt carrier. This firing pin is typically found on M16 selective fire variants. The very early SP-1 series commercial sporter AR-15 manufactured until the 1966/1968 period utilized, according to Colt sources, a large diameter flange that is unique to itself (larger flange then 62294) . We do not have a source for this firing pin configuration at this time. The period 1966 through 1968 was a transitional period during which Colt did a running production change to incorporate the small flange firing pin and altered bolt carrier into the commercial AR-15 variations. Please Note: The circa 1995 Colt Parts Book shows the SP62294 large flange firing pin as being used in all but two applications. This is in error. With exception of the early SP-1 sporter and the M16 variants as noted above, typical post 1966/68 sporters will utilize the SP63039 Small Flange firing pin. SP63039 Small Flange, Brownell #[URL='http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=4391']160-000-205 [/URL]. Flange diameter is nominal .343". This firing pin is used in conjunction with a unique bolt carrier and hammer. The bolt carrier features a shallow ramp cut at the rear of the hammer path and no shroud at the rear of the hole for the firing pin. The hammer has a notch on the upper front striking face. The design concept behind these parts was to create a system that would prevent the firearm from going full auto should the disconnector fail or be inadvertently forgotten during reassembly of a firearm. In such an instance the hammer will follow the ramp cut down the rear of the carrier. At this point, as the bolt carrier moves forward to strip a fresh cartridge from the magazine, the notch on the face of hammer will engage the flange of the firing pin and stop the forward movement of the bolt carrier. [/QUOTE]
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AR15/10 Rifles
Firing pins for AR with large skirt
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