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Maple Leaf VSR Upgrade Aluminium 7075 Piston — 90° Trigger Sear

Maple Leaf VSR Upgrade Aluminium 7075 Piston — 90° Trigger Sear

£27.95
£27.95
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DETAILS

SKU: 42822107
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For 90 degree trigger sears. The 7075 aluminium piston cut for VSR-10 rifles and compatible platforms using a 90 degree trigger sear. Maple Leaf also make a 45 degree version, and the two are not interchangeable, so identify your trigger unit before you order.

Aircraft-grade 7075 is chosen for its strength-to-weight ratio. In a spring rifle that matters twice over: the part has to survive repeated impact without deforming, and it has to stay light enough that it is not fighting the spring on the way forward.

At roughly 25 grams it is in the range where the cycle stays quick but the body has enough metal to take the sear load. The tolerances are held tight so it runs in the cylinder without rocking, which is what keeps the air seal even across the stroke.

The 90 degree sear geometry is the common arrangement on upgraded trigger units. If your rifle has been through a trigger upgrade already, this is more likely to be the piston you want than the 45 degree one.

Specifications

Specification Detail
Material 7075 aluminium alloy
Finish Silver
Weight Approximately 25 grams
Trigger sear 90 degree — not the 45 degree grip type
Platform VSR-10 and compatible spring rifle platforms
Tolerances Machined to run square in the cylinder

Good to know before you buy

The trigger unit decides which piston you need. A 90 degree sear and a 45 degree grip are different geometries and the pistons are cut to match. Fitting the wrong one gives you an engagement that can let go under a strong spring, which is the one failure you do not want on a sniper build.

Weight is part of the tuning, not just a number. A heavier piston carries more momentum but takes longer to accelerate. The 25 gram class is the usual compromise for VSR builds and is what most published spring and cylinder advice assumes.

Check how it sits in the cylinder before you close it up. It should slide without rocking and without drag. Any play translates into an uneven seal, and drag costs you the velocity the spring is providing — related parts in spare and upgrade parts.

Frequently asked questions

Which piston does my rifle take?
It depends on the trigger unit rather than the rifle model, because many VSR platforms have had the trigger replaced. If you are unsure, tell us which trigger set is fitted and we will tell you which of the two pistons matches.

Why 7075 rather than steel?
Steel would be stronger but much heavier, and the extra mass slows the stroke. 7075 gives most of the strength at a fraction of the weight, which is why it is the standard choice for this part.

Does it come with an O-ring?
Treat the O-ring as a separate consumable and fit a fresh one when you build. A new piston running an old ring is the most common reason a rebuild chronographs lower than expected.

Will it work with a very heavy spring?
That is what it is for. The case for an alloy piston grows with spring power, because the stock part is where high-power builds usually fail first. Pair it with a matched spring guide and cylinder.

⚠ Identify the trigger sear before ordering. This is the 90 degree piston. In a 45 degree trigger block the engagement is wrong and can slip under load. The two parts look similar in photographs, so go by the trigger unit rather than by appearance.
💡 Titan Forge Airsoft tip: Degrease the cylinder and the piston before assembly, then grease deliberately rather than generously. Too much grease on a spring rifle slows the stroke and sprays down the barrel on the first few shots. More VSR parts in our sniper rifle section.