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MynameisJeff
Site Supporter
Location: Everett Joined: Wed May 17, 2017 Posts: 71
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What is the little block that says "COLT"?
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Fri May 26, 2017 4:56 pm |
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os2firefox
Site Supporter
Location: Everett, WA Joined: Sat Aug 4, 2012 Posts: 2798
Real Name: Snek on de ladder
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Colt sear block, see https://geissele.com/colt-rifle-users-guide/Quote: About 1989-1990, Colt began installing sear blocks in their lower receivers to prevent the later installation of auto-sear components. The photographs below show a standard receiver without a sear block (Fig. 1), a receiver with a pinned-in sear block (Fig. 2), and receiver with an integral sear block (Fig. 3).
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Fri May 26, 2017 5:05 pm |
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MynameisJeff
Site Supporter
Location: Everett Joined: Wed May 17, 2017 Posts: 71
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Amazing! Thank you. Though I can't for the life of me understand why they would want to keep you from going full auto... ¯\_(ツ)_/¯
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Fri May 26, 2017 5:32 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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Damn . . . I learn something new every day if I'm not careful.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Fri May 26, 2017 7:36 pm |
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jukk0u
Site Supporter
Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21147
Real Name: Vick Lagina
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Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.)
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith
"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams
“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli
Láodòng zhèng zhūwèi zìyóu
FJB
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Sat May 27, 2017 12:31 pm |
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Massivedesign
Site Admin
Location: Olympia, WA Joined: Fri Mar 11, 2011 Posts: 38291
Real Name: Dan
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jukk0u wrote: Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.) Can't you just remove the block and use any BCG you want?
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Sat May 27, 2017 2:24 pm |
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Guntrader
In Memoriam
Location: Mukilteoish Joined: Sat Mar 26, 2011 Posts: 11595
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I'd prefer to not do business with a company who voluntarily invented sear blocks and such when they were never a legal requirement.
_________________ NRA Endowment Member. How did they know my member was well endowed?
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Sat May 27, 2017 2:31 pm |
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OhShoot!
Site Supporter
Location: Bellingham Canada Joined: Thu Jan 3, 2013 Posts: 4998
Real Name: Josheewa
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Is that the Hillary block? I've heard the Hillary hole has fallen out of favor, and hasn't been sighted in over 37 years.
_________________ It must be frustrating always being the smartest person in the room.-Jagerbomber35
Divided we fall.
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Sat May 27, 2017 3:02 pm |
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Guntrader
In Memoriam
Location: Mukilteoish Joined: Sat Mar 26, 2011 Posts: 11595
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Huma knows where it is.
_________________ NRA Endowment Member. How did they know my member was well endowed?
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Sat May 27, 2017 3:05 pm |
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OhShoot!
Site Supporter
Location: Bellingham Canada Joined: Thu Jan 3, 2013 Posts: 4998
Real Name: Josheewa
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Guntrader wrote: Huma knows where it is. Huma hasn't seen a good Weiner in a long time
_________________ It must be frustrating always being the smartest person in the room.-Jagerbomber35
Divided we fall.
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Sat May 27, 2017 3:13 pm |
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zombie66
Site Supporter
Location: Spanaway WA Joined: Wed Jul 6, 2011 Posts: 6301
Real Name: Hugo Stiglitz
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This may sound crazy but I just went out and looked at my older Colt's to see if I had one of these.....................NOPE I'm good.
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Sat May 27, 2017 3:56 pm |
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1811GNR
Site Supporter
Location: East Renton Plateau Joined: Tue Jul 5, 2011 Posts: 909
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Massivedesign wrote: jukk0u wrote: Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.) Can't you just remove the block and use any BCG you want? Unfortunately along with the block there is a large steel pin that retains it. The pin is in the location that an auto sear pin would occupy in a full auto lower. It is also larger diameter than the sear pin to make it extremely difficult to install an auto sear. Colt tried their damndest to get ahead of the "assault weapon" mania of the late '80's/early'90's, they didn't go full Bill Ruger but close. Guntrader wrote: I'd prefer to not do business with a company who voluntarily invented sear blocks and such when they were never a legal requirement. No Ruger, (Bill was father of the 10 round magazine idea) or S&W (sweetheart trigger lock deal with the Clinton administration) for you either I assume? Sent from my iPhone using Tapatalk
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Sat May 27, 2017 4:55 pm |
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jukk0u
Site Supporter
Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21147
Real Name: Vick Lagina
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Massivedesign wrote: jukk0u wrote: Specialized Armament will machine that block down flush with the lower rcvr (for a small fee) so you can use a full auto BCG (note: the entire process is legal,m and using a full auto BCG does not turn your AR into a machine gun. Using the FA BCG will give you more mass if your require it to cycle propelry for your setup.) Can't you just remove the block and use any BCG you want? The block is hardened steel, and I think you pretty much destroy the lower digging it out. (it might be cast into the aluminum?)
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith
"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams
“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli
Láodòng zhèng zhūwèi zìyóu
FJB
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Sat May 27, 2017 5:15 pm |
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Massivedesign
Site Admin
Location: Olympia, WA Joined: Fri Mar 11, 2011 Posts: 38291
Real Name: Dan
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Ahhh. I read that it was pinned in, didn't know it was basically permanently pinned and is there to hide/block the infamous third hole.
That makes sense why they did it, to allow them to. Or have to destroy their unsold lowers when the GCA came crashing down.
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Sat May 27, 2017 6:33 pm |
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Unicorn
Joined: Tue Apr 19, 2011 Posts: 2597
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They can be removed with some effort. You have to make a couple careful cuts to get through the pin in the side of the receiver so you can pull it off the pin that's on the bottom. Once you do though, you'll have large holes in your receiver. You could probably epoxy in some blanks to fill them, or maybe thread them and use flat set screws to fill them.
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Sat May 27, 2017 11:05 pm |
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