Pro Riser Mod 1 T&E Results

Technical Evaluation Report: Test 1

Project Code: Pro Riser Mod 1

Date: April 27, 2025

Test Lead: Connor Grogan

Subject: Structural Integrity, Zero Retention, and Repeatability Analysis

1. Test Bed & Hardware Specifications

To isolate the performance of the mounting interface, the following hardware was utilized:

  • Chassis: AR-15 (10.3" Ballistic Advantage Barrel) with YHM Turbo T2 Suppressor

  • Optic: Eotech EXPS 3-0 & G33 3x Magnifier

  • Component Under Test: Pro Riser Mod 1 (7075-T6 Aluminum)

  • Ammunition: Winchester 55gr FMJ (Bulk)

  • Telemetry: Garmin Xero C1 Pro Chronograph

  • Rest: Bench-stabilized wooden rifle block

2. Ballistic Baseline & Thermal Normalization

To ensure data accuracy, the rifle underwent a thermal stabilization period consisting of a 90-round fire cycle (3 magazines) prior to record-firing. This eliminated "cold-bore" shift as a variable.

60-Shot Sample Chronographic Data: | Metric | Value | Technical Significance |

 Average Velocity | 2766.8 FPS | Establishes baseline kinetic energy. 

 Extreme Spread (ES) | 169.6 FPS | Predicts ~1.75" of vertical ammunition "noise." 

 Standard Deviation (SD) | 37.3 FPS | Confirms non-match grade consistency. 

Control Grouping 20 rounds ( No Riser ) (100y) | 6.875" H / 4" V | Mechanical floor of rifle/ammo/shooter.

Wind Variable: Blowing West 8mph during testing. Range faces north.

3. Stress Protocol: Multi-Axis Impact Testing

The rifle was subjected to a high-G impact series from shoulder height (approx. 5.5ft) onto compacted soil. The goal was to induce mounting shift or fastener failure.

Impact Schedule:

  • 3x Vertical Drops: Impacting directly on the optic (Maximum Lever-Arm Stress).

  • 3x Lateral Drops: Impacting on the side of the riser/optic.

  • 3x Longitudinal Drops: Impacting on the buttstock (Shear Stress on mounting lugs).

Observed Peripheral Failures:

During the impact series, the Cloud Defensive Rein 3.0 weapon light suffered a catastrophic mounting failure.

  • Initial Impact: Picatinny rail interface sheared; light remained tethered only by the remote switch cable.

  • Tertiary Impact: Full separation of the light and pressure switch from the rail.

  • Significance: The impact force exceeded the structural limits of established third-party hardware, providing a high-stress benchmark for the riser's performance.

Mounting Interface Failure on Cloud Rein 3 With KFF Defense Pro Riser Mod 1 Visibly still attached and sturdy

A photo of the Rein 3 completely detached from the rifle as described in the testing results of the KFF Pro Riser Mod 1


4. Zero Retention & Repeatability Results

Following the impact series the rifle was fired for group consistency after each 3 drop groups.

  • Post-Impact Grouping: 4" x 4" - 10 rounds (Observed 40% improvement over baseline).

  • Point of Impact (POI) Shift: Negligible. Group center remained consistent with pre-impact coordinates.

  • Physical Inspection: 7075-T6 body showed zero plastic deformation. Fasteners maintained torque specs. No "walking" or peening of the Picatinny recoil lugs was observed.

5. Final Engineering Conclusion

The Pro Riser Mod 1 successfully maintained a consistent zero despite high-G impacts that resulted in the structural failure of secondary rail-mounted components.

The transition from a 6.8" horizontal spread to a stabilized 4" group suggests that the riser’s geometry provides a more repeatable ergonomic weld, effectively reducing shooter-induced error without compromising the mechanical integrity of the optic-to-rail interface.

Purchase Your KFF Defense Pro Riser Mod 1 Here