AR6520 Acceptance

AR/M4 AR General Discussion
1

Highlights of acceptance inspections for new Colt AR6520 patrol rifles, standard issue in the agency:

Buttstock Group:

Four position collapsible. No markings. No play in stock on receiver extension. Standard buffer spring. Extension includes “H” buffer. Castle nut properly staked.

Lower Receiver:

Markings correct and typical “AR-15A2 Government Carbine”. Marked for LE/gov restriction. Without apparent flaw or defect. Typical newer Colt semi-auto machined lower receiver. Smooth trigger pull, crisp 6# break, no grit. Correct fillister head grip screw.

Upper Receiver:

Devoid of any marking, forge, model, or otherwise. Extended feed ramps cut post-anodizing, and unfinished. Ramps cut neatly, true to barrel extension. Correct A2-type sight mechanically zeroed with 8/3 wheel. No excess rotation.

Bolt Group:

M16 bolt carrier with full tang, shrouded firing pin. M16 firing pin. “C” marking on carrier. “C” marking on bolt. Correct extractor spring assembly. Bolt greased. Keys well staked.

Barrel:

Correct 1/7, chrome lined, no apparent chamber or feedway flaw. Compensator/flash hider A2-type, timed correctly. FSB alignment correct and visually aligned. Front sight mechanically zeroed.

Accessory Pack:

2ea 20rd aluminum USGI magazines, with Colt baseplates. Black polymer follower. Manufactured 11/05. Extended two-point black sling. Chamber and bore brushes, segmented cleaning rod, operators manual.

All gauges passed. No defects or failures identified.

Accepted pending live-fire, 500+rds each.

2

There’s something about this post that I just… like.

:smiley:

3

Interesting- I haven’t seen that yet, especially in the newer “Colt Defense” marked weapons. I also do not see any proof stamps near the dust cover. I am familiar with their occasional M4 ramps that are cut post-anodization, but again not since the change to Colt Defense.

The “C” marked bolt is another Colt item that I have only seen on the civilian market models (i.e. MT6400C with Colt’s MFG rollmark). All of the CD marked ones I’ve worked with had the MPC designation.

Thanks for the post; I enjoyed it too! I do not know if Ekie is a member here, but he would probably find your info interesting as well for his Colt database purposes.

4

I was under the impression that A2 uppers had the ramps cut post to match the extension and A4 flat tops came with the pre cut ramps.

5

Nice rifle,simple no frills A2 carbine…just the way I like em;)

6

So every carbine arriving at your agency receives this pre-acceptance inspection?

7

Excellent post! I wish I was there to help you do the acceptance inspections and live-fire :smiley:

8

Looks just like the two of them I bought last year.

9

Not sure what the standard is, if there is one. I suspect it changes with available components. My own 6520s, and 6520s from the 2005 buy, were cut pre-anodizing.

10

Any firearm (handgun or long gun) used on duty, whether personally or agency owned. Eliminates a lot of problems down the line.

Most neighboring agencies do it to, to one extent or another. Very useful in purchasing and deployment decisions.

11

Good review… I have one and love it… got mine with some tooling marks but hey that adds on to the beauty of the carbine… planning on putting a Vltor mod stock on it one of these days.

DT!

12

Skintop,
Many thanks for another most-thorough acceptance post!

13

I see yours has the new selector switch allso…Wish they’d go back to the older model. Guess it’s a Diemaco “thing.” :rolleyes:

14

That’s a Hartford gun, produced here. Diemaco guns are the other thread.

But yes, it does appear to be the new standard.

15

Unless I am seeing an illusion, the feedramp cuts on the receiver are narrower in width than those on the barrel extension.

It is much more obvious on the RH ramp. The LH end of the RH ramp cut on the receiver ends before it matches with the same edge of the extension ramp.

ETA: It is entirely possible that I do not know exactly what M4 feed ramps are supposed to look like. All I have to go on is what is on my LMT upper.

16

Bump for an asnwer to my question re: feedramps.

17

We had a Colt AR come in to our shop that had M4 cuts cut into its upper receiver AFTER it had been anodized (ramps were raw aluminum) but I cannot remember if it was on a 6721 or a 6520. This was about 1 month ago.

18

The 6520 I bought a couple months ago is the same way.

I think Colt is just using up the A2 receivers they have laying around.

19

Let’s just say I would not have accepted the machining of feed ramps such as these.

20

While they do not line up perfectly can you tell me why you would not accept them
i.e what exactly do you think is wrong with them.