Compensator Install

A compensator is a muzzle device designed to reduce muzzle rise. A compensator will “compensate” for a firearm muzzle’s rise after you fire a shot, this directly affects follow-up shots because they help you recover your sight picture by shooting flatter.

There are many articles about what is best out there. We leave that up to you.

You want to make sure your compensator is timed correctly. Timing is simply insuring that the ports are properly positioned. With the proper tools and hardware provided with your device I can get you timed and aligned correctly.

Here are a couple Shots of what I do:

AR compensator Service 1
AR compensator Service
AR compensator Service 2
AR compensator Service

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

AR-15 Bolt Carrier Group (BCG) Test Pin Tray

I started working on a holder for the AR15 Bolt Carrier Group (BCG) Pins. The idea came from School of the American Rifle. I wanted to be able to remove the pins if needed. I also did not want to paint my pins for GO / Warn / NO-GO. Here is what I came up with.

Got everything printed up in the right colors and numbers. You can switch it up how ever you like:

AR-15 BCG Test Pin Tray What you print
Everything printed up in the right colors

Then I put it all together. I had to cleanup everything with sandpaper, file and an Exacto knife. With a little help from a small nylon hammer. I got everything in place. Even tried a little infill using model paint.

AR-15 BCG Test Pin Tray Put Together
AR-15 BCG Test Pin Tray Put Together

Added all the pins in:

AR-15 BCG Test Pin Tray All together
AR-15 BCG Test Pin Tray All together

So far it is working out pretty good. It is another tool in the toolbox when troubleshooting AR15 Bolt Carrier Groups (BCG) The pin sizes are born out of the data I pulled from my research HERE.

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

AR15 Buffer Spring Measurement Jig

REF: Army TM 9-1005-319-23&P Nov 2008, Page 0021-10:

Check free length of action spring. RIFLE ONLY: The free length must be between 11 3/4 in. (29.85cm) minimum and 13 1/2 in. (34.29 cm) maximum. CARBINE ONLY: The free length must be between 10 1/16 in. (25.56 cm) minimum and 11 1/4 in. (28.58 cm) maximum. If measurements are notaccurate, replace. Do not attempt to adjust the length by stretching the action spring.

Your manufacture might be different, in making the jig I used the above.

If you have a 3D printer it is a cheap print. This is too long for a standard print bed, I used my Ender Extended 400×400 print surface for this one.

You can download the STL on Thiniverse

To help check the length of your buffer spring I created 2 versions of the AR15 Buffer Spring Measurement Jig; Rifle and Carbine length. The Center is minimum length and the other is maximum length. Your printer might be different so double check measurements after printing.

AR15 Buffer Spring Measurement Jig 01
AR15 Buffer Spring Measurement Jig 01
AR15 Buffer Spring Measurement Jig 02
AR15 Buffer Spring Measurement Jig 02

With Rifle Spring:

AR15 Buffer Spring Measurement Jig 03
AR15 Buffer Spring Measurement Jig 03

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

AR15 Gas Block Tool

A tool to help hold your gas block while you are trying to drive the gas tube pin in or out. It is plastic, if you beat on too hard or too many times it will break. Not to fear! it is a cheap and relatively fast print.

AR15 Gas Block Tool 02
AR15 Gas Block Tool main jig

As an extra bonus, I created a extension tube holder!

AR15 Gas Block Tool 03
AR15 Gas Block Tool group shot

Group shot:

AR15 Gas Block Tool 01
AR15 Gas Block Tool working

Print your own! Files are on Thingiverse

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

AR-15 Upper Receiver Diagrams – Working Document

I am using this as a working documents to be used as I inspect a rifle.

Upper Receiver Drawing with pin gauging
Upper Receiver Drawing with pin gauging
AR15 Upper Receiver Diagram
AR15 Upper Receiver Diagram

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

Gas Block Barrel Dimpling

Dimpling your barrel to help secure your gas block is key to ensuring the gas system of your AR will continue to function correctly. A loose gas block can cause havoc to the cycling of your AR. I dimple at least once directly under the gas port. I can dimple twice, but realize that different manufactures have different spacing for the second screw. If you want or need to change your existing gas block you have to use a gas block with the same set screw spacing. Not a huge issue for some, but if the new gas block you want has a different spacing you would need to get another barrel to accommodate the different spacing.

Using the proper tools I do the dimpling.

Gas Block Dimpling Drilling
Gas Block Dimpling Drilling

I blue it up to match the barrel:

Gas Block Dimpling Finishing
Gas Block Dimpling Finishing

Now ready to get the gas block installed.

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

Present Arms Custom Receiver Alignment Block

My Present Arms Gunners Mount Kit is awesome. The one thing I wanted different was the Receiver Alignment Block. It does not seem to fit right on non-mil spec buffer tubes I work on. How can they know all the sizes?

You can see the gap here, it will not seat all the way.

Present Arms Receiver Alignment Block Original Bottom
You can see the gap here, it will not seat all the way.

And that is because the buffer tube rail is too wide.

Present Arms Receiver Alignment Block Original Top
And that is because the buffer tube rail is too wide.

So I do what I do and made one. Seats all the way down

So I do what I do and made one. Seats all the way down
So I do what I do and made one. Seats all the way down

And tightly fits the buffer tube rail

And tightly fits the buffer tube rail
And tightly fits the buffer tube rail

The metal rod it ¼ inch and I cut it down to just below the top.

The metal rod it ¼ inch and I cut it down to just below the top.
The metal rod it ¼ inch and I cut it down to just below the top.

Then topped it off with a couple of the included caps.

Then topped it off with a couple of the included caps.
Then topped it off with a couple of the included caps.

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All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

Present Arms Sleeve

A sleeve to help hold your castle nut wrench firmly in place while cranking it down on your Present Arms Gunners Mount.

I can not claim this idea as my own, I was watching this video from School of the American Rifle and though “What a great idea”. I did not have any 1 ¼ inch PVC laying around, but I do have a 3D printer and PLA. This is what I came up with for the below wrenches.

Forward Controls:

Present Arms Buffer Tube Sleeve 05
A sleeve to help hold your castle nut wrench firmly in place Forward Controls
Present Arms Buffer Tube Sleeve 02
A sleeve to help hold your castle nut wrench firmly in place Forward Controls

Magpul:

Present Arms Buffer Tube Sleeve 03
A sleeve to help hold your castle nut wrench firmly in place Magpul
Present Arms Buffer Tube Sleeve 06
A sleeve to help hold your castle nut wrench firmly in place Magpul

Wheeler

Present Arms Buffer Tube Sleeve 04
A sleeve to help hold your castle nut wrench firmly in place Wheeler

Family Shot:

Present Arms Buffer Tube Sleeve 07
A sleeve to help hold your castle nut wrench firmly in place all 3

Present Arms on all sizes:

Present Arms Buffer Tube Sleeve 08
A sleeve to help hold your castle nut wrench firmly in place Present Arms

Hit us up with comments or questions

All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

Torque Values

My Torque Values:

AR Compensator (Flash hider) No Torque, timing value with the procedure in the Army TM. Hand tight and then tighten a minimum of 90 degrees but no more than 450 degrees to timing. Don’t over tighten, don’t loosen.

AR Barrel Nut 30 Ft. lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut. The 80 Ft. Lbs is not stated in the TM, but I don’t know how you would line up the gas tube, without going over 30 Ft. Lbs. Unless you use shims. I don’t think most folks will have any laying around. This torque spec is common across the community and internet.

AR Carrier Key Screws 50-58 INCH pounds torque

AR Lower Receiver Extension (Buffer Tube/Castle Nut) 40 Ft. lbs for both Rifle and Carbine.

M-LOK Accessories:

For attaching metal accessories to metal hand guards: 35 in/lbs

For attaching polymer or metal accessories to polymer hand guards: 15 in/lbs

For attaching polymer accessories to metal hand guards: 15 in/lbs

The installation torque values are not minimums, they are recommended limits. The nylon patch compound may slightly affect the torque reading if using an in/lb torque wrench.

Using a small hex wrench should prevent over-tightening. Remember that the recoil lugs are doing most of the work, and excessive torque on the nuts is not required

My Comments:

The rest of the items in the research below I could not find in the Army TM, manufacture website or in common reference. Until I can find it, I am going with ‘tight’ and the appropriate thread lockers. ‘Tight’ might be the values listed.

I am not saying that the info below is wrong or bad. I could not readily verify it. The above is what I will use, at the end of the day I am responsible for my decisions and you are responsible for yours.

########### RESEARCH ITEMS BELOW ###########

AR Compensator (Flash hider), 15-20 Ft. Lbs. Torque *1

AR Compensator (Flash hider) *3 (No Torque, timing value)

Army TM Flash Hider
Army TM Flash Hider

AR Handguard Screws, 20-30 inch pounds torque *1

AR Gas Block Set Screws, 25-30 inch pounds torque *1

AR Barrel Nut, 30 Ft. lbs. Minimum, not to exceed 80 Ft. Lbs. to align the next slot in the barrel nut. *1 *5

AR Barrel Nut, 30 Ft. lbs. *3 (I cant find the 80 Ft. Lbs. In the TM)

Army TM Barrel Nut
Army TM Barrel Nut

AR Carrier Key Screws, 50-58 INCH pounds torque *1 *2 *3

Army TM Gas Key
Army TM Gas Key

AR Grip Screw, 15-20 inch pounds torque *1

AR Lower Receiver Extension (Buffer Tube/Castle Nut)

Rifle: 35-39 Ft. Lbs. *1 *3

Army TM Lower Receiver Rifle
Army TM Lower Receiver Rifle

Carbine: 38-42 foot pounds *1 *3

Army TM Lower Receiver Carbine
Army TM Lower Receiver Carbine

M-LOK Accessories: *4

For attaching metal accessories to metal hand guards: 35 in/lbs

For attaching polymer or metal accessories to polymer hand guards: 15 in/lbs

For attaching polymer accessories to metal hand guards: 15 in/lbs

The installation torque values are not minimums, they are recommended limits. The nylon patch compound may slightly affect the torque reading if using an in/lb torque wrench.

Using a small hex wrench should prevent over-tightening. Remember that the recoil lugs are doing most of the work, and excessive torque on the nuts is not required

KeyMod Accessories: *1

Polymer to metal: 15 in-lbs

Polymer to polymer: 15 in-lbs

Metal to metal: 30 in-lbs

Picatinny Accessories: *1

Polymer to metal: 15 in-lbs

Polymer to polymer: 15 in-lbs

Metal to metal: 35-60 in-lbs

Ref:

*1 https://www.youtube.com/watch?v=Ah6WISs6IfY

*2 https://www.youtube.com/c/InstructorChad

*3 ARMY TM 9-1005-319-23&P Nov 2008

*4 https://www.dropbox.com/s/jrf9nwxnizjy6ql/M-LOK_Tips.pdf?dl=0 (Magpul MLOC instructions)

*5 https://www.youtube.com/watch?v=tcMqwofYTn0 (Brownells)

Hit us up with comments or questions

All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

Feed Ramp Polishing

Not all feed ramps need to be polished. If you fire quality ammo with good quality barrel and upper, you might be good. If you reload and like to try different projectiles, cast your own or you are having feed issues, good idea to polish them up.

When I polish feed ramps I do it with the barrel removed from the upper. I am not going to risk screwing something up on the upper. It is more work to remove the barrel but worth the effort for a better finished product.

Here is a before shot:

Feed Ramp Polishing Before
Feed Ramp Polishing Before

Feed Ramp after polish and clean up:

Feed Ramp Polishing After
Feed Ramp Polishing After

Hit us up with comments or questions

All Documents posted on this site are for informational use only. If you make ANY modifications to your Weapons based on this site, you do at your own risk! If done incorrectly, you can render you weapon unsafe and / or unusable.

More HERE: https://viking-armory.com/?page_id=723

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