Colt 607 Clone

[36g]

Just starting a new winter project, a Colt 607 clone. Have parts on order or detailing drawings for those not available or adaptable.

Progress so far is on barrel assembly. Have front sight base modified to cut off bayonet lug. Barrel is a .223 Wylde 1-8, 10.5". Unfortunately it was a .750 FSB diameter so turned down visible portion between FSB legs to a pencil profile. Have a triangle front end cap and am waiting on triangle rear end cap. Cut down a 4.5" XM177E2 style muzzle brake at front and rear to yield a 3.5" compensator. Needed to thread muzzle an additional .5" (back to FSB) and to tap interior of brake an additional .5" to get everything to fit. Will use a split/spring washer between FSB and brake.



Planning on using a A1 style upper.

Buttstock will use an entry style buffer tube and I'll manufacture the locking guide rod and buffer end plate along with the locking mechanism and buttplate and lock lever. Debating on using an original A1 stock that has obvious wear or a repro, same with handguard. Will probably use a standard A1 pistol grip although a cut down one would be easy to make also as a second option.

[Texas by God]

By A1 style upper, do you mean the fixed carry handle style?


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[36g]

A1 style upper is an M16A1 style with fixed carry handle and teardrop bolt assist and two position flip rear sight.

The A2 style also had a fixed carry handle but had a round bolt assist and a fully adjustable rear sight. They didn't come out until after Vietnam, maybe sometime in the 1980's.

[Texas by God]

Thanks.
I have an A2 laying around here- but that’s not what you are looking for.
Good luck on your build.


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[36g]

Progress thus far:



Fitting barrel assembly to upper receiver (FSB needs to be drilled and pinned but need rear handguard cap to arrive and be inserted).

Decided to use a used A2 stock (will be cut down once buffer tube arrives) and repro handguards (to be cut down once rear handguard cap is fitted.

Metal for the buttstock rod and buttplate should arrive today. Buffer tube extension (bolt carrier stop lock ring) arrived today as did A1 style rear sling swivel and base.

[Gtek]

Um, I have to ask- I know you know that is not a pistol, and I know you know that is not a rifle, and depending on how long that bloop tube is out front and if it's going to be welded. I know you know you need to send off right at $200 with a S/N and description and wait a little bit before pushing those two 1/4" pins in place. Also, the hole on bottom of FSB can be drilled and tapped for set screw, makes mock ups and alignment much easier. I have even shot my crazy builds with just set screw, neutral rear and tweak front until happy center then drill and pin. Wondering what this triangle rear cap looks like?

[36g]

Thanks for your concerns - I have an 07 SOT so once completed will be registered on appropriate Form.

The rear cap looks much like the front cap only larger. It has a metal lip to fit into the handguard retainer ring. The handguards themselves are straight cut across without any lip.

https://retrorifles.com/colt-607-rear-handguard-cap/

[Larry Gibson]

Few VFOG SOG vets over on an SF forum that would love to have that when it's done, nice work.

[36g]

Few VFOG SOG vets over on an SF forum that would love to have that when it's done, nice work.

Thanks for the compliment!

Depending on how this build goes I may be tempted to do another for sale. We'll see.

I do like the VN era carbines. Have made clones of a Colt 605, GAU 5/A, and XM177E2. All have pinned and welded muzzle devices. Did a Colt 635 SBR and a 10mm version similar to a 635 as a SBR.

[Gtek]

07 SOT, GOTCHA! One never really knows what is behind the keyboard. I have one of those guys in my circle, a blessing and a curse!

[FergusonTO35]

Thanks for the compliment!

Depending on how this build goes I may be tempted to do another for sale. We'll see.

I do like the VN era carbines. Have made clones of a Colt 605, GAU 5/A, and XM177E2. All have pinned and welded muzzle devices. Did a Colt 635 SBR and a 10mm version similar to a 635 as a SBR.

I would love to have a 635 pistol or SBR. You ever make them for sale?

[36g]

I would love to have a 635 pistol or SBR. You ever make them for sale?

I could do either as a semi auto. Options would be to start from a Colt RO639 parts set (if Colt parts were wanted) or from scratch using mix and match parts. PM if interested.

[FergusonTO35]

I could do either as a semi auto. Options would be to start from a Colt RO639 parts set (if Colt parts were wanted) or from scratch using mix and match parts. PM if interested.

My bad, yes I mean semi-auto. My funding is pretty tight right now but I may try to do this next year. I'll send you a PM.

[36g]

Progress - rear handguard cap received and installed and repro handguard cut down and fitted. It locks in tight. Next step will be to drill and ream taper pin holes then affix front sling swivel.

[bronte454]

I have been collecting parts for some time now . It all started with the MP-mold 225-75. I decided to build 607(loosely) clone that will be a dedicated 75 grain cast boolit shooter. I have an 12.5” barrel in 223 Wylde with 1:8 twists. I just received the triangle handguard I had the well a Delta spring and the triangle metal caps from previous purchase . The only thing I don’t have yet is a lower receiver and the muzzle brake . I do have sb4(?) black brace for mine . If health will pick up I might make down to the shop to start the production

[36g]

Completed upper - all parts assembled and metal finished in Duracoat Colt gray.





Have parts, metal, and tools to work on buttstock and attachment points, Version 1. Version 2 parts on order.

[36g]

Buttstock, Version 1

Donor A2 stock on pistol buffer tube. Buffer tube has been turned down to rifle buffer O.D.


Pistol buffer turned to rifle OD attached to lower receiver with end plate and cut down castle nut.


Original stock alongside pistol buffer tube. Stock is marked to shorten.

[36g]

Shortened buttstock.

[jdgabbard]

Cool build man. I did a A1 build several years back - only with a 1/9" pencil barrel instead of a 1/12". It was what I could find at the time, and honestly is a little more practical if shooting 55gr than the 1/12". The biggest problem I had was finding a proper lower, so I ended up going with a standard lower for now until I can find a proper A1 lower without all of the reinforcements. Also went with the 360degree birdcage instead of the 3-prong flashhider.

Wouldn't mind getting my hands on one of those Brownell's Retro Prototype ARs with the charging lever under the carry handle.... Retro Rifles are very cool.