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11/2/2025 2:24:06 PM EDT
[#1]
I just got one of these for $600 with an aftermarket rail of some sort or another on it. I'm hoping it shakes out and is a pretty decent rifle. Been wanting to try a bullpup and I figure that is the cheapest way to get it out of my system.
11/2/2025 2:56:30 PM EDT
[#2]
Quote History
Originally Posted By Nameless_Hobo:
I just got one of these for $600 with an aftermarket rail of some sort or another on it. I'm hoping it shakes out and is a pretty decent rifle. Been wanting to try a bullpup and I figure that is the cheapest way to get it out of my system.
View Quote

Run it hard a day hot.  Find the screws that come lose and locktight.  Also, yank out the two rotating sling anchor points in the back.  
Enjoy!   Great gun
11/12/2025 7:45:49 PM EDT
[#3]
What do you mount above your bedroom doorframe, for grabbing as heading out when things go bump in the night?





11/12/2025 7:48:20 PM EDT
[#4]
with a cheap, on a 45 degree mount.  surprisingly good light.  and light

Amazon Product
  • \u2705 \u3010Slidable for Full & Compact Rail\u3011Slidable rail offers your the best postion freely. Also makes the pistol laser light combo be compatible with G2C /G3C/ Glocks w/ a rail perfectly. No Sticking out for compact pistols.



Amazon Product
  • For 45 degree offset attachment of picatinny optics or accessories to Picatinnny mounting platforms

12/10/2025 1:25:49 PM EDT
[#5]
Quote History
Originally Posted By lazyengineer:
What do you mount above your bedroom doorframe, for grabbing as heading out when things go bump in the night?


https://i.postimg.cc/fR75bHg7/20251112-173714.jpg


View Quote



I finally picked up that RDB from the shop. It has this same handguard on it.
Is there anything else you recommend? I have seen some replacement butt plates and such.
I was thinking about a PA prism as well for it, i currently just have an old holosun 503g I was going to put on it temporarily so i can go shoot it some.
12/10/2025 2:29:49 PM EDT
[#6]
Quote History
Originally Posted By Nameless_Hobo:



I finally picked up that RDB from the shop. It has this same handguard on it.
Is there anything else you recommend? I have seen some replacement butt plates and such.
I was thinking about a PA prism as well for it, i currently just have an old holosun 503g I was going to put on it temporarily so i can go shoot it some.
View Quote View All Quotes
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Quote History
Originally Posted By Nameless_Hobo:
Originally Posted By lazyengineer:
What do you mount above your bedroom doorframe, for grabbing as heading out when things go bump in the night?


https://i.postimg.cc/fR75bHg7/20251112-173714.jpg





I finally picked up that RDB from the shop. It has this same handguard on it.
Is there anything else you recommend? I have seen some replacement butt plates and such.
I was thinking about a PA prism as well for it, i currently just have an old holosun 503g I was going to put on it temporarily so i can go shoot it some.

score!

Grip tape, they make an RDB specific one

I replaced muzzle device with the old A2 sized BCM Warfighter, love it.  and yank out the two rear spinning sling points (where I have the HK sticker)  those are weakly installed failure points that will lock up your gun.

12/10/2025 3:48:24 PM EDT
[#7]


Came with everything in the picture except the holosun and sling.
Pretty good package in my opinion. The mag catch is a really interesting design.

I shot about half a mag through it, it’s pretty good so far. I’m hoping it shakes out good because my wife really likes it, she’s left handed so an ambi rifle is convenient.

I’ll pull the sling mount when I get home. Thanks.
12/10/2025 5:57:00 PM EDT
[#8]
Quote History
Originally Posted By Nameless_Hobo:
https://i.ibb.co/v45QLV5N/IMG-1975.jpg

Came with everything in the picture except the holosun and sling.
Pretty good package in my opinion. The mag catch is a really interesting design.

I shot about half a mag through it, it’s pretty good so far. I’m hoping it shakes out good because my wife really likes it, she’s left handed so an ambi rifle is convenient.

I’ll pull the sling mount when I get home. Thanks.
View Quote

I hate the mag release.  a lot.  its located at the nominal handling carry point.   aaaannnd now your mag just hit the deck.  I've been meaning to look into how to stiffen it up.
12/12/2025 9:40:05 PM EDT
[#9]
I stuck a modlite body on the handguard, so we will see how that goes. I am trying to figure out an ambidextrous switch set up as my wife is left handed.
12/13/2025 3:19:11 AM EDT
[#10]
The rifle in the pic is not a "real HK"!

I can tell because I can see the bullets in the magazine are pointed the wrong way!
12/13/2025 3:23:35 AM EDT
[#11]
Quote History
Originally Posted By lazyengineer:

I hate the mag release.  a lot.  its located at the nominal handling carry point.   aaaannnd now your mag just hit the deck.  I've been meaning to look into how to stiffen it up.
View Quote


Try putting a short screw pin or rivet through it or and a spring behind it and over the screw pin or rivet.

test concept by gluing a short pencil eraser on the back with the spring over it first.

Or maybe insert one of the cone (as opposed or compared to a purely cylindrical body) type foam ear plugs with teh base up top. Just for a proof of concept.
12/30/2025 12:47:42 PM EDT
[#12]
Quote History
Originally Posted By TSH77769:


Try putting a short screw pin or rivet through it or and a spring behind it and over the screw pin or rivet.

test concept by gluing a short pencil eraser on the back with the spring over it first.

Or maybe insert one of the cone (as opposed or compared to a purely cylindrical body) type foam ear plugs with teh base up top. Just for a proof of concept.
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By TSH77769:
Originally Posted By lazyengineer:

I hate the mag release.  a lot.  its located at the nominal handling carry point.   aaaannnd now your mag just hit the deck.  I've been meaning to look into how to stiffen it up.


Try putting a short screw pin or rivet through it or and a spring behind it and over the screw pin or rivet.

test concept by gluing a short pencil eraser on the back with the spring over it first.

Or maybe insert one of the cone (as opposed or compared to a purely cylindrical body) type foam ear plugs with teh base up top. Just for a proof of concept.


Ugh. I keep coming back to this discussion in the hope that someone figured out a real fix for the crappy mag release. IMHO, the RDB is the best design concept for a self-loading bullpup and only let down by a few minor cost-cutting features. The mag release is crying out for a total replacement and I wish the aftermarket would offer one.
12/30/2025 4:19:48 PM EDT
[#13]
Quote History
Originally Posted By StealthyBlagga:


Ugh. I keep coming back to this discussion in the hope that someone figured out a real fix for the crappy mag release. IMHO, the RDB is the best design concept for a self-loading bullpup and only let down by a few minor cost-cutting features. The mag release is crying out for a total replacement and I wish the aftermarket would offer one.
View Quote View All Quotes
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Quote History
Originally Posted By StealthyBlagga:
Originally Posted By TSH77769:
Originally Posted By lazyengineer:

I hate the mag release.  a lot.  its located at the nominal handling carry point.   aaaannnd now your mag just hit the deck.  I've been meaning to look into how to stiffen it up.


Try putting a short screw pin or rivet through it or and a spring behind it and over the screw pin or rivet.

test concept by gluing a short pencil eraser on the back with the spring over it first.

Or maybe insert one of the cone (as opposed or compared to a purely cylindrical body) type foam ear plugs with teh base up top. Just for a proof of concept.


Ugh. I keep coming back to this discussion in the hope that someone figured out a real fix for the crappy mag release. IMHO, the RDB is the best design concept for a self-loading bullpup and only let down by a few minor cost-cutting features. The mag release is crying out for a total replacement and I wish the aftermarket would offer one.

Agreed.  This is the single greatest flaw to serious field usage of the RDB.  Magazine security is vital, and the curent system is too easily bumped - for the advantage of shaving half a second on a mag-reload; which was the wrong call.  

It's not immediatly obvious how to readily rectify this on our own.  I imagine someone might come up with a way, but it's not clear to me.  Ideas like increasing the tension via a spring and screw might work, but have their issues.  if I'm going to drill a hole for a screw, can I just drill a hole that will sopport an AR15 style button appoach?
12/31/2025 12:17:20 PM EDT
[#14]
Quote History
Originally Posted By lazyengineer:

Agreed.  This is the single greatest flaw to serious field usage of the RDB.  Magazine security is vital, and the curent system is too easily bumped - for the advantage of shaving half a second on a mag-reload; which was the wrong call.  

It's not immediatly obvious how to readily rectify this on our own.  I imagine someone might come up with a way, but it's not clear to me.  Ideas like increasing the tension via a spring and screw might work, but have their issues.  if I'm going to drill a hole for a screw, can I just drill a hole that will sopport an AR15 style button approach?
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By lazyengineer:
Originally Posted By StealthyBlagga:
Originally Posted By TSH77769:
Originally Posted By lazyengineer:

I hate the mag release.  a lot.  its located at the nominal handling carry point.   aaaannnd now your mag just hit the deck.  I've been meaning to look into how to stiffen it up.


Try putting a short screw pin or rivet through it or and a spring behind it and over the screw pin or rivet.

test concept by gluing a short pencil eraser on the back with the spring over it first.

Or maybe insert one of the cone (as opposed or compared to a purely cylindrical body) type foam ear plugs with teh base up top. Just for a proof of concept.


Ugh. I keep coming back to this discussion in the hope that someone figured out a real fix for the crappy mag release. IMHO, the RDB is the best design concept for a self-loading bullpup and only let down by a few minor cost-cutting features. The mag release is crying out for a total replacement and I wish the aftermarket would offer one.

Agreed.  This is the single greatest flaw to serious field usage of the RDB.  Magazine security is vital, and the curent system is too easily bumped - for the advantage of shaving half a second on a mag-reload; which was the wrong call.  

It's not immediatly obvious how to readily rectify this on our own.  I imagine someone might come up with a way, but it's not clear to me.  Ideas like increasing the tension via a spring and screw might work, but have their issues.  if I'm going to drill a hole for a screw, can I just drill a hole that will sopport an AR15 style button approach?

Hmm....   this actually looks doable, and like it might fit.





If I had a spare lower chassis, I'd try it.
12/31/2025 9:04:50 PM EDT
[#15]
Quote History
Originally Posted By lazyengineer:

Hmm....   this actually looks doable, and like it might fit.

https://i.postimg.cc/VvCcv9fL/20251231_100803.jpg

https://i.postimg.cc/NFqQ1CPx/20251231_100916.jpg

If I had a spare lower chassis, I'd try it.
View Quote

Isn't this basically how the mag release on the Hunter models work?
1/1/2026 10:44:01 AM EDT
[#16]
Quote History
Originally Posted By Pomyluy:

Isn't this basically how the mag release on the Hunter models work?
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Quote History
Originally Posted By Pomyluy:
Originally Posted By lazyengineer:

Hmm....   this actually looks doable, and like it might fit.

https://i.postimg.cc/VvCcv9fL/20251231_100803.jpg

https://i.postimg.cc/NFqQ1CPx/20251231_100916.jpg

If I had a spare lower chassis, I'd try it.

Isn't this basically how the mag release on the Hunter models work?

oh.  there we go.  hadn't looked at the hunter model, but yes, I see it now.  well there we go, how do I get those parts and modify my stock to accept?
3/1/2026 11:40:12 PM EDT
[Last Edit: lazyengineer][Edited] [#17]
Fun range outing with a co-worker from Czech.  








4/11/2026 10:05:05 AM EDT
[Last Edit: lazyengineer][Edited] [#18]
Took it out over Easter Weekend and plinked at steel at 100, 200, and 300 yards.  It ran great of course.  not a whole lot more to say, it's a cool little gun ;)

Aside from that, the dating thing has been sucking up a lot of my time; less shooting.
4/11/2026 12:58:17 PM EDT
[#19]
I have been intrigued by these little guns for a while. I have a few Kel Tec guns - SU-16, Sub 2000 and a couple KSG shotguns and really like them. I have a few friends who have the RDB and they keep pressuring me to get one, subconsciously.
Be the change you want in this world.
4/11/2026 1:08:05 PM EDT
[Last Edit: lazyengineer][Edited] [#20]
Quote History
Originally Posted By patw:
I have been intrigued by these little guns for a while. I have a few Kel Tec guns - SU-16, Sub 2000 and a couple KSG shotguns and really like them. I have a few friends who have the RDB and they keep pressuring me to get one, subconsciously.
View Quote


You should.

KelTec did something special here and are the only ones to actually pay attention to, and address, the issues that bullpups face.    This is the only 5.56 Bullpup I bother with anymore, and is the only kel-Tec I own; and likely will ever own.

Most bullpups are too heavy, too terrible of a trigger, difficult to swap sides on the fly, gas-by-face, and in some cases, just recoil a lot more than they should.   KelTec addresses all of those items.

Of course, it's made to KelTec standards, so accuracy is kind of meh; but good enough.
6/19/2026 5:24:26 AM EDT
[#21]
Put another 30 rounds or so through it today doing some load testing.  Very good ball ammo groupings and shooting today.  Who knows, maybe the barrel is breaking in or something.

Set up for some prone shooting


Targets set at 200 yards


55 ball grouping - zero is good enough for me, on the little 3x optic


Also testing some MK311 50 gr frangible ammo, that I didn't expect much from.  Honestly, I'm pretty happy with this 200 yard grouping for what is supposed to be CQB Machine-Gun grade ammo :)


6/19/2026 10:13:31 AM EDT
[#22]
Oo nice
6/20/2026 11:54:49 AM EDT
[Last Edit: lazyengineer][Edited] [#23]


So FWIW, this is a fairly regular issue with the RDB when you shoot from the bench or prone.  The brass lands on the ground where your support arm is.  

When afoot, or in long sleeves, it's not a factor.  But prone or at the bench - be aware.
6/21/2026 12:13:29 AM EDT
[Last Edit: Odinforever2000][Edited] [#24]
Quote History
Originally Posted By lazyengineer:
https://i.postimg.cc/pXDZbTPQ/20260620-082135.jpg

So FWIW, this is a fairly regular issue with the RDB when you shoot from the bench or prone.  The brass lands on the ground where your support arm is.  

When afoot, or in long sleeves, it's not a factor.  But prone or at the bench - be aware.
View Quote

Yup! Makes the RDB the hardest bullpup for me to shoot form the bench for that reason.  I've had to get creative to avoid that hazard.

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