Oregon OAL Question with Bullpup Conversion

[midwestcitymen]

I was planning on buying a Ruger 10/22 with a 16.4" threaded barrel to suppress (Model 32004) as my first gun, and putting the Hightower MBS-22 Mod 1 Bullpup Conversion on it, where it says that with the stock extended and a barrel length of 16.4", has an OAL of 26.25", and when the stock is collapsed it shrinks by about 2".
I'm in Oregon. I am very new to firearms, but would this mean I'd need to get an SBR stamp because it can collapse below 26" OAL? Is that how that works, or is that not something I would need to worry about? Would I be able to shoot it with stock collapsed at the range?
Also wanting to make sure that I can buy the rifle, take off the stock it comes with, and install the conversion? Apologies if these are stupid questions haha. Any help appreciated.

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[Stomper]

Telescoping stocks in the minimum position don't count, the ATF looks at the length with it fully extended.

As for the bullpup conversion kit, they all look like futuristic high-speed "cool guy" gear, but most kits (and bullpups in general) have horrible "squishy"' triggers.

Since you say you're new firearms, I suggest starting out with the 10/22 as-is to get intimately familiar with all the mechanics and operation before you dive into the world of modifications.

 

[midwestcitymen]

Telescoping stocks in the minimum position don't count, the ATF looks at the length with it fully extended.

As for the bullpup conversion kit, they all look like futuristic high-speed "cool guy" gear, but most kits (and bullpups in general) have horrible "squishy"' triggers.

Since you say you're new firearms, I suggest starting out with the 10/22 as-is to get intimately familiar with all the mechanics and operation before you dive into the world of modifications.

Yeah, I plan to get used to the rifle for a while before I do any modifications or anything. Just making sure what I plan to buy is going to work for it in the future. Thanks

 

[echo1]

I thought it was what the smallest rifle configuration could be, was the minimum OAL for it not to be SBR,. Your best source is your states DOJ, second old-time LGS, last believable source is the NET. Surprisingly, the Shernic SKS conversion has a great trigger. I also have a ,22 Muzzleite I built for my son. He could one hand it like a pistol, PAX

 

[bradsteen]

The KelTec CMR30 is under 23" collapsed, wouldn't be legal if the law required manufacturers to go off of collapsed length.

 

[echo1]

The KelTec CMR30 is under 23" collapsed, wouldn't be legal if the law required manufacturers to go off of collapsed length.

Please provide the states quote of the reg for centerfire OAL and .22 reg for OAL in the minimum lengths allowed. Again check with your state.PAX
Kali
Key California Length Rules for Semi-Automatic Centerfire Firearms:

• Rifles: An OAL under 30 inches classifies it as an assault weapon.
• Other Semi-Auto Centerfire Guns (not rifle/pistol/shotgun): An OAL under 30 inches makes it an assault weapon.
• Federal NFA: Under federal law (National Firearms Act), rifles must generally have a barrel of 16 inches or more and an OAL of 26 inches or more to avoid NFA registration, but California's state laws add stricter requirements.

.22 reg is 26 inches in the shortest configuration

 

[bradsteen]

Please provide the states quote of the reg for centerfire OAL and .22 reg for OAL in the minimum lengths allowed. Again check with your state.PAX
Kali
Key California Length Rules for Semi-Automatic Centerfire Firearms:

• Rifles: An OAL under 30 inches classifies it as an assault weapon.
• Other Semi-Auto Centerfire Guns (not rifle/pistol/shotgun): An OAL under 30 inches makes it an assault weapon.
• Federal NFA: Under federal law (National Firearms Act), rifles must generally have a barrel of 16 inches or more and an OAL of 26 inches or more to avoid NFA registration, but California's state laws add stricter requirements.

.22 reg is 26 inches in the shortest configuration

Not citing state law, but federal - all I'm saying is because the CMR30 collapsed OAL is under 23" but is not considered an SBR, @Stomper is correct in stating OAL for rifles is not measured from collapsed position.

 

[ilikegunspdx]

I was planning on buying a Ruger 10/22 with a 16.4" threaded barrel to suppress (Model 32004) as my first gun, and putting the Hightower MBS-22 Mod 1 Bullpup Conversion on it, where it says that with the stock extended and a barrel length of 16.4", has an OAL of 26.25", and when the stock is collapsed it shrinks by about 2".
I'm in Oregon. I am very new to firearms, but would this mean I'd need to get an SBR stamp because it can collapse below 26" OAL? Is that how that works, or is that not something I would need to worry about? Would I be able to shoot it with stock collapsed at the range?
Also wanting to make sure that I can buy the rifle, take off the stock it comes with, and install the conversion? Apologies if these are stupid questions haha. Any help appreciated.

I would check into others reports of effect on the trigger before I did anything. Bullpups have notoriously bad triggers. No experience with your proposed kit though personally. I would rather get an hk 416 in pistol form, mp5 in pistol form, or hammerli tac r1 in pistol form (put a brace or stock on them). Much better guns than the kit your proposing imo and same or less cost. Or get tx-22 pistol and add a universal brace for $70 or a really nice Calloway designs chassis for $89.

Or spend a bit more and get the outstanding Stribog .22. All those guns will be smaller and better guns imo. Study more woudl be my suggestion. 10-22 with bullpup kit would be almost the last .22 I would buy of the many dozens of .22 options available.
Universal brace works on any med to full sized pistol:

IMG_0366.jpeg

• ilikegunspdx
• Jan 12, 2026

Stribog, propbably the most accurate (when shooting fast I mean, not long range bench rest) and fastest shooting .22 you can buy.

IMG_9975.jpeg

• ilikegunspdx
• Nov 23, 2025

Tx-22 with Calloway chasis and non moving red dot:

IMG_7867.jpeg

• ilikegunspdx
• Nov 14, 2025

IMG_7941.jpeg

• ilikegunspdx
• Nov 14, 2025

Grand power k-22. Excellent trigger. This gun with a universal brace is very nice.

IMG_3033.jpeg

• ilikegunspdx
• Nov 23, 2025

Similar sized gun excellent quality is colt 1911 made by Walther (green one in pic below, all these .22s are made by Walther):

IMG_3047.jpeg

• ilikegunspdx
• Feb 28, 2025

For a rifle sized gun I would get the G36 without question. Excellent rifle.

IMG_3619.jpeg

• ilikegunspdx
• Apr 12, 2025

I only list suppressable semi autos above due to your interest, and I am leaving out all the excellent 22 revolvers, 22 lever guns, bolt actions, pumps, and 22 classics etc. again of those maybe 100? Different guns available, a bullpup 10/22 would be in the bottom 5-7 or so for me. Also as you research I suggest avoiding anything made by GSG or the mp40 clone.

 

[The Heretic]

I would check into others reports of effect on the trigger before I did anything. Bullpups have notoriously bad triggers. No experience with your proposed kit though personally. I would rather get an hk 416 in pistol form, mp5 in pistol form, or hammerli tac r1 in pistol form (put a brace or stock on them). Much better guns than the kit your proposing imo and same or less cost. Or get tx-22 pistol and add a universal brace for $70 or a really nice Calloway designs chassis for $89.

It depends on the design/type of the trigger linkage. If they do it right, they can actually improve the trigger by increasing the leverage.

Many bullpups use a pushrod type of linkage. Because of the friction and the tendency of the rod to bend, this makes the trigger worse.

OTOH, if the design uses a bellcrank at each end, and uses a rod/cable/etc. to pull on the bellcranks, then the trigger can be as good as original, or even better (depending on the length, design and leverage of the bellcranks).

I used to own an AWC G2A with bellcranks and cable linkage and the trigger was excellent. I recently bought a Desert Tech bullpup conversion stock for a 10/22 that has a similar setup (but with a rod) and they claim it actually improves the trigger pull by lightening it. Reviews support that claim.