Geissele HK MR 556 Trigger

Geissele HK MR556 Trigger

A Geissele two-stage trigger for the HK MR556 and semi-automatic HK 416 rifles. It is similar to Geissele’s Super Semi-Automatic (SSA): a light first stage followed by a clean second-stage break, non-adjustable.

• Two-stage, non-adjustable pull of approx. 4.5 lb total (SSA-type weights)
• Fits the HK MR556 and semi-automatic HK 416
• Mil-spec pin size

Designed to work with the mil-spec 90-degree safety selector; compatibility with short-throw safeties is not known. Note: once installed, the hammer must be cocked before the safety can be engaged – unlike the original HK trigger, the selector cannot be put on Safe with the hammer forward.

Specifications:

• Platform: HK MR556 / semi-auto HK 416
• Type: 2-stage, non-adjustable
• First stage: 1.25-1.36 kg (2.75-3 lb)
• Second stage: 0.68-0.79 kg (1.5-1.75 lb)
• Total pull weight: 1.93-2.15 kg (4.25-4.75 lb)
• Pin size: mil-spec
• Geissele part number: 05-220
• Weights are approximate (maker data)