Did the SP1 always have a trapdoor stock ?
Page 2 of 2 FirstFirst 1 2
Results 11 to 20 of 20
Like Tree52Likes

Thread: Did the SP1 always have a trapdoor stock ?

  1. #11
    Junior Member

    Member #
    64295
    Join Date
    Jul 2018
    Location
    South Milwaukee, WI
    Posts
    34
    Liked
    33 times
    Mine SP1 from 1974 has it (storage box) and the birdcage flash hider. If two 1971 above don't have it, it could have started around 1972-74 time frame.
    ei8ht likes this.

  2. #12
    Junior Member

    Member #
    6621
    Join Date
    Aug 2009
    Location
    north coast
    Posts
    16
    Liked
    18 times
    I read that M16's started to get the trap door stocks around 1971. I imagine AR15's wouldn't get them until much later.
    ei8ht likes this.

  3. #13
    Senior Member

    Member #
    36649
    Join Date
    Sep 2016
    Location
    Washington State
    Posts
    236
    Liked
    226 times
    Quote Originally Posted by BARgunner View Post
    I have a SP1 from 1971 and it has the rubber butt pad and the three prong flash hider. I bought it from the original owner and he didn't change anything on it.

    My '71 SP1 has the birdcage FH, and this is the first one I have seen with the 3-prong FH that is later than 1969. Another case of Colt using up older available parts, which does makes $$$ sense.

  4. Remove Advertisements
    ColtForum.com
    Advertisements
     

  5. #14
    Junior Member

    Member #
    56130
    Join Date
    Nov 2017
    Location
    MA
    Posts
    21
    Liked
    18 times
    Berkeley 492, Very nice - looks minty - and I'm interested to see this! Thank you. So you have an original 71 sp1 with a three-prong flash hider and and a type D butt stock. May I ask, what are the barrel markings and is there a knurled crush washer or a lock ring with wrench flats holding the flash hider in place?
    usgi1911A1 and ei8ht like this.
    NRA Life Member

  6. #15
    Supporting Member
    Supporting Member

    Member #
    29747
    Join Date
    Oct 2015
    Location
    Washington
    Posts
    127
    Liked
    459 times
    Here are a few pictures of my 1971 SP1 posted above showing the barrel marking, the flashhider and lock washer and the butt stock. The lock washer appears to be very lightly knurled. I don't think I've ever seen an original 3 prong flash hider that had wrench flats. There is a special wrench slotted for the 3 prong flash hider that is used to remove and replace the flash hider.








    Here's a picture of the barrel markings on my M16A1 upper assembly. The lock washer is knurled, barrel marking is different and the A1 flash hider has wrench flats.
    RDS, usgi1911A1, ei8ht and 1 others like this.
    "When in doubt, empty the magazine!"

  7. #16
    Supporting Member
    Supporting Member

    Member #
    30730
    Join Date
    Feb 2016
    Location
    WI
    Posts
    493
    Liked
    984 times
    Quote Originally Posted by BARgunner View Post
    There is a special wrench slotted for the 3 prong flash hider that is used to remove and replace the flash hider.
    That's cool. If anyone has a picture of one of those I'd like to see it.
    usgi1911A1 and ei8ht like this.
    Berhati-hati di ruang platform. 🇸🇬

  8. #17
    Senior Member

    Member #
    20336
    Join Date
    Feb 2013
    Location
    NV
    Posts
    972
    Liked
    633 times
    My very first Colt SP1 I bought brand new in 1971 (about Spring - Summer time) had the rubber butt pad, no trap door and it had the A1 birdcage flash suppressor.

    I bought it for around $200, it was an excellent rifle, I used it for about 13 years then sold it and bought the new '84 model Colt AR-15A2 Sporter II rifle.
    usgi1911A1 and ei8ht like this.
    NRA Life Member since 1973
    Colt AR-15 Sporter SP1 rifle owner since 1971
    Colt AR-15A2 Sporter II carbine owner since 1985
    Colt 1911 Government Model Series 80 .45 pistol owner since 1984

  9. #18
    Supporting Member
    Supporting Member

    Member #
    2203
    Join Date
    Jun 2006
    Location
    Indiana
    Posts
    173
    Liked
    716 times
    SP1 with serial number SP19821 has the rubber butt plate.

    Bill
    ei8ht likes this.

  10. #19
    Supporting Member
    Supporting Member

    Member #
    29747
    Join Date
    Oct 2015
    Location
    Washington
    Posts
    127
    Liked
    459 times
    Quote Originally Posted by Redcat94 View Post
    That's cool. If anyone has a picture of one of those I'd like to see it.
    "When in doubt, empty the magazine!"

  11. #20
    Junior Member

    Member #
    56130
    Join Date
    Nov 2017
    Location
    MA
    Posts
    21
    Liked
    18 times
    Does anybody know about the barrel markings for '69 or '70 SP1's? Would "MP" and just "C" with no "B" mean the barrels with chromed chambers but unchromed bores?

    I think the chromed chamber started in about 1967 for the M16's and then switched to C MP C. By 1969 the M16's were getting the C MP B barrels with chromed bore. That would follow what is being described here, using up outdated M16 components on the SP1.

    Anyone know for sure?
    NRA Life Member


 
Page 2 of 2 FirstFirst 1 2

Home | Forum | Active Topics | What's New

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
We are not associated with Colt's Manufacturing LLC. We are an enthusiast site comprised of Colt Fans.
Powered by vBulletin® Version 4.2.3
Copyright © 2019 vBulletin Solutions, Inc. All rights reserved.
SEO by vBSEO ©2011, Crawlability, Inc.