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1/25/2018 7:38:29 AM
Posted: 11/17/2003 5:50:13 PM EST
In planning for my first build, I had wanted to find an A1 style upper with a LW barrel. Another member graciously pointed me in the direction of CDNN. They have new 20' SP1 uppers w/tri-handguards and seem to be a good deal other than having to modify for post-ban compliance at $399.
1)Can anyone tell me if these would be large hole uppers?
2)Are these likely to be old 1/7 barrels?


Link Posted: 11/17/2003 8:04:56 PM EST
If it's a real Colt SP1 upper, it will have a large diameter pivot hole and a 1:12" twist barrel. BTW, the A1 has always been my favorite. [^] Here's mine. [white](If the photo server is working.)[/white] [img]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=74[/img]
Link Posted: 11/18/2003 1:11:01 AM EST
[Last Edit: 11/18/2003 1:12:43 AM EST by shamayim]
The CDNN pieces are small hole, M16A1 type units. As are the bolt/carrier assemblies thry're selling. Therefor, they'll match up with any current production lower just fine. They are, however, 1 in 12 twist; not 1 in 7. BTW, I fully agree that this is a good way to go, if you want an A1 type piece.[:D]
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