HK MP5 Accessories & Upgrades: Optics, Stocks & Mounts

MP5 Accessories & Upgrades: What to Buy First

Buy the optic-mounting solution first, because everything else on the gun is usable out of the box and the missing rail is the one hard gap. After that, spend where the dollar returns the most capability: a red dot, then the cheap charging-handle fix, then spare magazines, then your rear (stock or brace), then a sling. The table ranks the categories; the sections below pick the exact part in each.

Two upgrades sit outside this list because they each deserve their own deep dive. Triggers are one: the MP5 accepts drop-in forced reset triggers and Super Safety lower packages, which we break down with fitment and legal detail in the best MP5 forced reset triggers guide, including the AS Designs drop-in cassette covered in our AS Designs AR-HK cassette breakdown. Suppressors are the other: the MP5 is one of the best 9mm cans hosts made, and the picks live in the best 9mm suppressor guide. Model a full loadout against other PCCs in our rifle builder.

Best MP5 Optics & Mounts

The mount decides the optic on an MP5, not the other way around. Two paths cover almost every build. An M-LOK handguard with an integrated 1913 top rail (the Midwest Industries HK MP5 M-LOK handguard) takes any Picatinny optic and adds light real estate. A receiver-clamp mount (the Midwest Industries MP5 Tall T2 mount) keeps the slim factory forend and presents an Aimpoint T1/T2 footprint directly. Because the Aimpoint Micro T-2 and the Holosun HE503CU-GR share that same tube footprint, either dot drops onto the low mount, which clamps solidly to the receiver rather than the thin factory rail.

1

Midwest Industries HK MP5 M-LOK Handguard

Best first upgrade: the optic rail the MP5 never had, plus M-LOK for a light

$120

View at OpticsPlanet

• +One-piece 6061-T6 aluminum with a full-length 1913 top rail that finally gives the MP5 a solid, repeatable optic mounting surface
• +M-LOK at 3, 6, and 9 o'clock for a weapon light or hand stop
• +Roughly 4.8 oz and hard-coat anodized; installs without gunsmithing on standard MP5/SP5 receivers

• −The added top rail raises the sight line versus a low receiver-clamp mount
• −Not for the .22LR MP5
• −Costs more than a bare M-LOK forend with no rail

2

Aimpoint Micro T-2

Best optic: the 2 MOA dot the low MP5 mounts are built around

$986.00

View at OpticsPlanet

• +2 MOA dot with a 5-year always-on battery life; the reference duty micro red dot
• +Compact T1/T2 footprint drops directly onto MP5-specific low mounts for a fast, head-up sight picture
• +Submersible, fully sealed housing shrugs off suppressed-9mm gas and hard use

• −Premium price relative to the gun for a budget MP5 clone
• −No integrated shake-awake; you leave it on and rely on battery life
• −Fixed 2 MOA dot with no reticle options

3

Midwest Industries MP5 Tall T2 Optic Mount

Best mount for keeping the factory handguard: direct T2 interface, no rail needed

$89

View at OpticsPlanet

• +Clamps to the MP5 receiver and presents an Aimpoint T1/T2 footprint directly, no separate rail required
• +Tall/absolute-cowitness height clears the diopter drum sights
• +6061 aluminum, returns to zero after removal, keeps the slim factory forend

• −T2-footprint only; a Picatinny optic needs the M-LOK rail handguard instead
• −Taller sight line than a purpose-built low mount
• −MP5/MP5K 9mm receivers only

4

Holosun HE503CU-GR Elite

Best value optic: green dot with shake-awake and a 50k-hour battery

$300

View at OpticsPlanet

• +Green 2 MOA dot / 65 MOA circle-dot reticle that the human eye picks up faster in low light
• +Shake-awake and solar failsafe stretch battery life to tens of thousands of hours
• +Same tube footprint as the Aimpoint, so it drops onto the same MP5 low mounts at roughly a third of the price

• −Not as abuse-proof as the Aimpoint T-2 under sustained suppressed fire
• −Circle-dot reticle can look busy for pure precision work
• −Housing is larger than the T-2

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Best MP5 Handguards

If your optic already rides a receiver-clamp mount, a full aluminum rail forend is redundant spend. The Magpul SL Hand Guard gives you M-LOK at 3, 6, and 9 o'clock and a built-in hand stop for a repeatable grip index at a fraction of the price, and it counts as a 922(r) compliance part on a clone build. It drops onto HK94/MP5 receivers with an 8-inch barrel.

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Best MP5 Stocks & Braces

Your rear end is decided by how the gun is registered. A full-size MP5 built as a short-barreled rifle wants a real collapsing stock, and the Magpul SL stock is the value pick: ambidextrous, an integrated QD socket, multiple lengths of pull, and roughly a third the price of a genuine HK or Zenith A3 steel stock. A single rear push-pin MP5 pistol (SP5, AP5, ZF-5, PTR 9CT) takes the SB Tactical SBT5 side-folding brace instead, which shortens the gun for transport and shoulders without a Form 1. K-models use the two-pin SBT5K, not the SBT5.

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Best MP5 Charging Handle & Controls

The MP5's small, high, non-reciprocating charging handle is the platform's biggest ergonomic complaint, and the fix costs almost nothing. The HKparts MP5 extended cocking handle roughly doubles the grab area, which makes the HK slap far easier and clears bulkier aftermarket handguards and low-mounted optics. It does not fit MKE AP5/AP5-P or MAC-5 without modification, so confirm your host before ordering.

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Best MP5 Slings

The MP5 has factory front and rear sling loops, so you can run the authentic HK three-point with zero added hardware. The Elite Survival Systems Three-Point HK sling uses those loops directly and keeps the gun indexed on the chest. If you would rather run a modern quick-adjust two-point, the Magpul MS4 Dual QD converts between two and one point, but it needs a QD mounting point: the MP5's factory loops are not QD without an adapter, so pair it with a QD end plate or the Magpul SL stock's built-in socket.

1

Elite Survival Systems Three-Point HK Sling

Best sling: the classic HK three-point that uses the factory loops

$42

View at OpticsPlanet

• +Attaches to the MP5's factory front and rear sling loops, no adapter hardware required
• +Three-point design keeps the gun indexed on the chest when slung
• +Runs 2- or 3-point and is the authentic HK retention setup

• −Three-point webbing is busier than a modern two-point across the receiver
• −For a QD two-point you will want the Magpul MS4 plus a QD end plate instead
• −Not a quick-adjust competition sling

2

Magpul MS4 Dual QD Sling

Best modern sling: quick-adjust two-point with dual QD

$66.45

View at OpticsPlanet

• +Quick-adjust two-point that converts to single-point via dual QD swivels
• +Wide, comfortable webbing for a heavier full-size MP5 SBR
• +Pairs with a QD end plate or the Magpul SL stock's built-in QD socket

• −Needs a QD mounting point; the MP5's factory loops are not QD without an adapter
• −Pricier than a plain HK-pattern sling
• −Overkill for a light, short K-configured pistol

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