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Author Topic: Ar-15 to bullpup conversion  (Read 163548 times)
SHORT-N-SASSY
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« Reply #180 on: February 19, 2016, 11:20:28 AM »


I just noticed our Site Ranking is #11
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I just noticed our Site Ranking is #10 !!!




I just noticed our Site Ranking is #9 !!!
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SHORT-N-SASSY
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« Reply #181 on: March 09, 2016, 10:16:46 PM »

FaxonNathan,

Considering that we're just two weeks away from Christmas 2015, can we plan on placing one/more of the following Faxon Firearms goodies under the Christmas tree?:

1, ARAK-21 Upper Receiver-6.5mm Grendel Barrel Assembly;

2, ARAK-31 Upper Receiver-6.5mm Creedmoor Barrel Assembly;

3, Bullpup Lower for the ARAK-21/ARAK-31.



I called Faxon Firearms, today, to inquire about their upcoming ARAK-31, to be chambered in .308/7.62x51mm NATO and 6.5mm Creedmoor (http://www.outdoorhub.com/news/2015/01/26/faxon-firearms-brings-arak-platform-30-cal-world/), as well as the long-rumored Bullpup Lower.

As Bob Faxon was not available, I spoke with "Jay." Jay advised that both the ARAK-31 and the Bullpup Lower presently are on hold, and couldn't offer a definite date when they might be released to our shooting world. However, Jay was quite familiar with the ARAK-31 design and offered some helpful input:

The ARAK-31 Bolt continues the radiused-lug design presently offered on the ARAK-21 Bolt, for improved strength, and the ARAK-31 Bolt is proportionately larger. When asked how the ARAK-31 breech design compared to the Armalite AR-10 and DPMS LR-308, referencing short-action magnum conversions by SSK Industries (http://sskindustries.com/ar-10/) and Accuracy Systems (www.accuracysystemsinc.com/), he said that the ARAK-31 design compares very favorably with those designs, and would be at least as strong as either of those designs. When asked if the ARAK-31 breech design would allow for converting to one of the short-action magnum cartridges, such as the 6.5mm SAUM, he answered that he saw no problem with that.

I thanked him for his helpful input.
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SHORT-N-SASSY
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« Reply #182 on: October 03, 2016, 09:54:16 PM »


I just noticed our Site Ranking is #11
[/size][/font]

I just noticed our Site Ranking is #10 !!!




I just noticed our Site Ranking is #9 !!!



I just noticed (10/3/2016), our Site Ranking is #6 !!!
« Last Edit: October 03, 2016, 10:05:32 PM by SHORT-N-SASSY » Logged
SHORT-N-SASSY
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« Reply #183 on: November 22, 2016, 01:14:19 AM »

. . . The AR-15 electronic trigger that was shown a few months ago at the shot show isn't available yet. I would positively go that route if it was available. . . .

Are you referring to Wave of the future: Electro-mechanical tirgger (http://youtu.be/gzfQFRzZXPw) --- ". . . an electronic signal that actually releases the trigger."

"ARAK-31 Upper compatible with LR-308 DPMS Lower Receivers." --- (http://www.faxonfirearms.com/p/116/arak).

Now, if the micro-switch of the planned Civilian Model (one shot, per trigger pull) of Michael's Machines Electro-mechanical trigger can be relocated, forward, and mounted to a Picatinny Rail-mounted Pistol Grip on the bottom of the handguard of the Faxon Firearms ARAK-31 Upper Receiver-20" Barrel Assembly, one need only mount a buttplate-buttpad to the rear of the DPMS LR-308 Lower Receiver to effect an after-a-fashion fire-by-wire .308 action-length Bullpup.





(https://digitrigger.com)
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SHORT-N-SASSY
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« Reply #184 on: March 10, 2017, 10:16:14 AM »

I today sent the following Message to Faxon Firearms President, Bob Faxon:



(http://bullpupforum.com/index.php?topic=6146.msg96233#msg96233)

(https://www.facebook.com/FaxonFirearms/posts/544677105669392)

(https://www.youtube.com/watch?v=08lLBpB_dLc&feature=youtube)

(https://www.youtube.com/watch?v=scPFyYyLRtY)

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unsungboxer
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« Reply #185 on: April 29, 2017, 09:58:06 AM »

Could this be a potential gamechanger?  A $55 buffertube at 3.5in may allow a LOP short enough to use a standard DI upper rather than expensive Faxon bufferless uppers.

http://www.thefirearmblog.com/blog/2017/04/29/pantheon-arms-mini-buffer-nra-17/

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therealgumby
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« Reply #186 on: November 16, 2017, 11:16:44 AM »

hey I know im waaaaaay late to this conversation but if you're not going to build the stock for resale is there any way one could at least get the blueprint for it? I'd love to have one myself
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SHORT-N-SASSY
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« Reply #187 on: August 12, 2018, 04:52:00 AM »


I just noticed our Site Ranking is #11
[/size][/font]

I just noticed our Site Ranking is #10 !!!




I just noticed our Site Ranking is #9 !!!



I just noticed (10/3/2016), our Site Ranking is #6 !!!


I just noticed, our Site Ranking is #3 !!!
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bullpup45
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« Reply #188 on: August 12, 2018, 08:31:55 AM »

https://pantheonarms.com/collections/short-buffer-systems/products/kentri-short-buffer-system
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Sputnik90
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« Reply #189 on: September 04, 2018, 12:07:13 AM »

^^ This.

This is a range report, for a 3D-printed "Hanuman" bullpup (https://github.com/maduce/fosscad-repo/tree/master/Rifles/AR-15_Hanuman_Bullpup_v1.1-WarFairy).  It was highly modified, to include the Pantheon Arms Kentri short buffer.

I liked the Hanuman bullpup for a start, but wanted to make a few changes.  A list:

- Changed the grip to accept a standard AR-15 grip.  The included built-in grip was too short and uncomfortably square.  To ensure clearance from the magazine, I canted the grip forward an almost-unnoticeable 5 degrees.  Later, I used a 3D-printed AR grip that was at a shallower angle, too, to make a bit more clearance.
- Added a safety.  It's just a (vaguely P90-inspired) rotating piece that blocks the trigger when on safe.  Simple, effective.  Probably not rigorously drop-safe.

After tacking it mostly together, I realized there really wasn't enough space between the grip and the magwell.  Most bullpups have 3-4" between the back of the grip and the magwell; the Hanuman was less than 2".  So, the next mod was:

- Add a 2" stretch plug.  Also 2" stretches of the trigger bar and mag release bar.
- Because the 2" longer mag release bar bent and buckled too much, added a retention piece to restrict the bending.

Print material is PETG.  Adhesive is standard hardware-store ABS adhesive.

After putting it together with an AR lower parts kit, there it sat while I tried to justify an ARAK-21 upper....and eventually I decided that was ridiculous; I was never going to spend that kind of money on this project.  The Pantheon short buffer tube offered a way to operate with an upper I already had on hand.  The price would be that I'd have to add the stock length for the tube.  Bleah.
So, with much trepidation, I made three more mods:

- Hacked off the aft (tower) section.
- Added a tower from the Phobos lower receiver (also by Warfairy).  Bonded in place with ABS adhesive, AND 4x M3 grub screws drilled in as pins to take the shear load.  For this job, I didn't trust glue in shear.
- Printed a new stock extension, 3.8" long overall, with a cutout for the Phobos tower and a through-hole for the Kentri tube.  You want access to the back, and this has it.


Despite all the stretching and the MUCH longer stock extension than I'd planned (I really didn't want ANY), length of pull is still an entirely reasonable 17.25".  Overall length with a 16" barrel is 29.25".

Short range report:  it worked fine.  I only got 40 rounds through it, but that's only because I didn't have much time; the weapon certainly would have taken more.  More next time.  Actually, next time I'll use my 7.62x39 upper Wink.

The trigger is...adequate.  Having the trigger bar pull in tension helps greatly; it's still a long painful slog compared to my M-17S, or even my RDB.  Maybe 8 lbs?  10?  I didn't measure it.  It's workable; not great.  I've shot much worse...not all of them bullpups.
The magazine release works surprisingly well.  For lefties not so well; the shaft twists and defeats the movement.  But for righties it's very effective.

Cheek weld is not so great.  With external ear protection, it's hard to get a good view through the sights.  Either I need to raise the sights, or print a new stock extension that moves the line a bit.  Or a bit of both.

There's no damage, and it's ready to go for more.  However, the retention pins will really require some attention; the aft one is printed (!) and it's just not strong enough; I'll replace it with a steel one.  The front one was compromised by a bit of ovaling of the hole to get everything to fit; I'm going to strengthen this area before the next trip to the range.

Oh, and it looks like this (attached).


* Hanuman1_1.JPG (732.97 KB, 3726x1296 - viewed 52 times.)
« Last Edit: September 04, 2018, 12:11:04 AM by Sputnik90 » Logged
Sputnik90
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« Reply #190 on: September 04, 2018, 12:25:15 AM »

 
   Total cost was surprisingly low:

$100 in PETG filament.  (Maybe.  I re-tried a number of parts.  Fortunately, the heavy ones worked first try).
$40 Lower Parts Kit.
$50 Kentri buffer tube (introductory pricing)
$239 AR-Stoner 16" upper, sale price at Midwayusa.com

Also, an MBUS rear sight ($40), a really cheap red dot sight ($30), and more filament ($20) for the grip and the handguards.

Here's another, older view.  The handguard and sight setup is not what I took to the range, but it shows the right side of the weapon and also shows the location of the magazine.


* Hanuman1_1_2.jpg (184.4 KB, 1682x742 - viewed 57 times.)
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bullpup45
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« Reply #191 on: September 04, 2018, 09:18:57 AM »

 Grin
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unsungboxer
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« Reply #192 on: September 16, 2018, 10:48:35 AM »

Grin

Congrats on making it this far!  I would love ro see someone try this with an Extar (EXP or EP9)  upper.  Having a cost effective polymer upper with side charger may provide some benefits.  Also, a gearheadworks tailhook arm brace on the Kentri buffer may look nicer and allow for a short barrel and OAL.

I really wish there were bullpup lower options for AR pattern.  Hunanum is 3d printable but honestly it won't take off.  We need modern designs that incorporate AR parts. 

The worse part of owning an x95 or Rdb is limited aftermarket support.
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