The Frame Game.

Walk into any Massachusetts gun shop and ask for a Glock 19. Watch what happens. The dealer will explain, in some version of the same speech we’ve given a thousand times, that they can’t sell it to you as a complete pistol. Same answer for plenty of other duty-grade handguns that the rest of the country buys without thinking twice. Then they’ll either say “sorry, can’t help you” — or they’ll mention something called the frame game.

The frame game is the legal mechanism Massachusetts LTC holders use to acquire pistols that dealers cannot sell complete. It is not a loophole, a hack, or a workaround in the pejorative sense. It is a method that operates entirely within the statute — one that exists precisely because Massachusetts has two parallel restrictions on dealer pistol sales that do not match what the law actually allows you to possess.

The Two Systems That Restrict Dealer Sales

Before the frame game makes any sense, you have to understand what’s actually keeping dealers from selling certain handguns complete. There are two systems, they were built independently, and they don’t fully overlap.

Here is the part nobody tells you in the shop because it sounds like legal hair-splitting: neither of these systems makes the underlying handgun illegal to own. They restrict the dealer. The Approved Firearms Roster is a list of handguns that have passed  testing. 940 CMR 16.00 sits under M.G.L. c. 93A — the consumer protection statute — and applies to the act of sale. Possession of an off-roster handgun by a Massachusetts LTC holder, lawfully acquired, is not a crime.

This is exactly why Glocks have always been the poster child for the frame game. Glocks are on the Approved Firearms Roster. They pass §123 safety testing. What they fail is the AG’s consumer-protection regulations — specifically, the load-indicator and magazine-disconnect requirements. Glock declined to redesign the gun, so MA dealers cannot sell complete Glock pistols at retail. The pistol itself remains lawful for LTC holders to possess.

How the Mechanism Works

The frame game works because of how Massachusetts law historically defined a “firearm” — and how it still defines what a dealer is restricted from selling. A pistol is the assembled, functional handgun. A frame is the serialized component that the ATF treats as the firearm under federal law, but under Massachusetts retail rules, a frame on its own is not the regulated “handgun” the roster and 940 CMR 16.00 apply to.

The dealer transfers the serialized frame through the standard process — ATF Form 4473, NICS, LTC verification, and MIRCS registration filed at the point of sale under 501 CMR 19.04(1). The frame’s manufacturer serial number is entered as the firearm’s serial number; the customer walks out with a registered firearm. The remaining components — slide assembly, barrel, recoil spring assembly, sights, magazines — are not federally serialized firearms and not state-restricted handguns. They are parts, sold like any other accessory in a separate transaction, with no paperwork. The customer assembles the pistol at home, and the registered frame becomes the registered, complete handgun. No new serial number, no new firearm, no new registration filing.

That is the entire mechanism. It is not clever. It is the direct legal consequence of how the dealer-sale restrictions are written.

What Chapter 135 Did to the Frame Game

Until 2024, the Massachusetts “firearm” definition was: a weapon “from which a shot or bullet can be discharged.” A bare frame can’t fire anything, so a frame wasn’t legally a firearm. That made the dealer side of the transfer cleaner: the dealer was selling a part, not a regulated handgun.

Chapter 135 of the Acts of 2024 (St. 2024, c. 135) rewrote that definition. The new §121:

The frame is now legally a firearm. Which immediately raised the question every Massachusetts dealer asked the morning of October 2, 2024: does that mean a frame has to be on the Approved Firearms Roster? Because if the answer is yes, the frame game is dead — you can’t put a bare frame through §123 drop testing.

The FCAB Position That Kept the Practice Alive

The Firearm Control Advisory Board, created by Chapter 135 itself (§50), worked through this question across early 2025. The board first addressed the parallel issue with rifles and shotguns: long guns are firearms under the new §121, so does the handgun roster apply to them too? The FCAB voted in February 2025 that long guns should be excluded from the roster testing requirements. The mechanism was the opening clause of §121:

The argument: the context of §131¾ (the handgun roster) clearly does not require long guns to be tested as handguns, because the testing protocol is designed for handguns and produces meaningless results when applied to rifles or shotguns. Secretary Reidy approved the FCAB’s recommendation and excluded long guns from the handgun roster.

At the April 11, 2025 FCAB meeting, the same logic was applied to handgun frames. Board counsel indicated that handgun frames should be analyzed similarly to long guns — a frame can’t be tested under the §123 protocol, so the “context clearly requires otherwise” clause applies, and frames need not appear on the handgun roster. Retailers, accordingly, may transfer handgun frames provided the resulting firearm would not be an Assault Style Firearm.

The Hard Limit: ASF Rules Still Apply

Here is the part of the conversation we have to have before the frame game gets oversold. The frame transfer mechanism does not bypass M.G.L. c. 140 §131M, which is the statute that prohibits Assault Style Firearms in Massachusetts. The §121 features test, the enumerated list, and the “copy or duplicate” provisions all apply to the resulting firearm regardless of how it was acquired.

What that means in plain English: if the pistol you’re trying to assemble would meet the §121 features test as an ASF-pistol — a detachable feeding device combined with two of the listed features (a magazine that attaches outside the pistol grip, a forward grip, a threaded barrel for a flash hider/silencer, or a barrel shroud) — the resulting firearm is an ASF, and §131M prohibits its possession. The frame can’t save you. Building it from parts can’t save you.

The good news is that the vast majority of pistols restricted from MA dealer sale aren’t ASFs at all. Glocks, Walthers, the M&P series in their standard configurations — these are blocked by 940 CMR 16.00 or by absence from the roster, not by the assault weapons ban. They’re consumer-protection cases, not weapons-control cases. Those are the pistols the frame game cleanly applies to.

How It Actually Goes

From walk-in to assembled pistol, the process is shorter than people expect:

1. Confirm Eligibility You hold a valid Massachusetts resident LTC. The frame is a firearm under §121; an FID is not sufficient for any handgun, frame or otherwise.
2. Pick a Lawful Pistol The completed pistol must not be an ASF under §131M. Most striker-fired duty pistols (Glock, certain Sigs, certain M&Ps) are off-roster but not ASFs. We’ll confirm before you commit.
3. Source the Frame Either we order the serialized OEM frame in directly, or you arrange for a frame to be shipped to us from another FFL.
4. 4473 + MIRCS Registration at Point of Sale The frame transfers to you on a standard transaction: ATF Form 4473, NICS, license verification, the full process. We file the MIRCS registration at the point of sale under 501 CMR 19.04(1), entered as a frame transaction with the OEM serial number. You walk out with a registered firearm. No additional registration for you to file later.
5. Acquire the Completion Parts — Separate Transaction Slide assembly, barrel, recoil spring assembly, sights, magazines. None of these are serialized firearms; none are regulated by the roster or by 940 CMR 16.00. Buy them from us on a seperate transaction, buy them online, buy them used — the completion-parts transaction is unconnected to the frame transfer.
6. Assemble at Home Drop the slide on the frame, install the barrel and RSA, sight it however you want, you’re done. No new registration. No new paperwork. The registered frame is the registered pistol — same serial number, same firearm. (Why no re-registration is required: see the next section.)

Do I Re-Register Once It’s Assembled?

Easily the most-asked question we get on this. The answer is no, and the answer is grounded directly in the registration regulations the Commonwealth promulgated in September 2025. Here’s the chain.

The trigger for a separate “privately made firearm” registration under M.G.L. c. 140 §121B(a)(2)(iv) and 501 CMR 19.04(5) is a firearm “manufactured or assembled” by someone other than a licensed manufacturer. So everything turns on whether putting a slide and barrel onto a registered OEM frame counts as “assembling” a privately made firearm. It doesn’t — the regulation says so directly:

Dropping an OEM Glock slide onto an OEM Glock frame, fitting a barrel into it, installing a recoil spring assembly — this is reassembly and the fitting of barrels. Both are explicitly excluded from the regulation’s definitions of “assemble” and “manufacture.” No new registration event triggers under §121B.

It also helps to understand why. Under §121 and 501 CMR 19.02, the frame is a firearm. The frame already has the manufacturer’s serial number. That serial number is presumed by the regulation, absent an ATF determination otherwise, to be the firearm’s serial number. When the dealer registers the frame in MIRCS at the point of sale, the registered firearm is the frame. Adding a slide and barrel doesn’t create a new firearm with a new serial number — it just turns the existing registered firearm into something that can fire. Same firearm, same serial, same registration.

What This Doesn’t Cover

A short list of things people regularly assume the frame game can solve, and can’t:

Where This Goes Next

Two things to keep an eye on. The first: Chapter 135 itself is the subject of a 2026 ballot referendum, the campaign for which was organized by GOAL. If the referendum succeeds, large portions of Chapter 135 — including the §121 redefinition that pulled frames into “firearm” status — could be repealed. The frame game would simplify back toward its pre-2024 form.

The second: EOPSS has not issued formal binding guidance on handgun frame transfers. The FCAB advisory position has been operating as the practical answer for over a year now, but a Secretary-level decision could be issued at any time, in either direction. If formal guidance comes down restrictive, dealers will adjust. If it comes down permissive, more dealers will likely start offering frame transfers.

For now — today, the day you’re reading this — the practice is alive, the statute supports it, and we do these transfers in the shop. We’ll keep updating this post as the law moves. For deeper statutory background, see our complete breakdown of Chapter 135 and our first-time buyer’s guide.