Guay v. Sig Sauer, Inc.
610 F.Supp.3d 423
D.N.H.2022Background
- On Jan. 28, 2020 Kyle Guay’s Sig Sauer P320 discharged while he was removing it from a holster; Guay says he did not pull the trigger and was shot in the thigh.
- Guay sued Sig Sauer for products liability, asserting design/manufacturing defects allowed an unintentional discharge.
- Guay proffered two experts: Peter Villani (firearms instructor/armorer and evidence custodian) and Timothy Hicks (mechanical engineer/consultant). Both examined Guay’s P320 and exemplar P320s (including CT scans) and identified misalignment, "rollover," and reduced contact between sear/striker parts.
- Sig Sauer moved to exclude both experts (Rule 702 challenges) and, contingent on exclusion, moved for summary judgment arguing Guay cannot prove defect or causation.
- The court admitted most of Villani’s and all of Hicks’s testimony: Villani is qualified to opine about firearm mechanics and observed defects but not qualified to opine on manufacturing process choices (e.g., mold vs. machining); Hicks was admitted in full. The court denied summary judgment.
Issues
| Issue | Plaintiff's Argument | Defendant's Argument | Held |
|---|---|---|---|
| Whether Villani is qualified to opine on P320 mechanics and defects | Villani’s extensive firearms experience and P320 armorer certification qualify him to describe component conditions and consequences | Sig Sauer: Villani lacks engineering/manufacturing background; armorer course insufficient for design/manufacture opinions | Qualified to testify about component condition, functioning, and how defects could cause discharge; not qualified to opine about manufacturing process (molding vs machining) |
| Whether Villani’s methodology is reliable (no functional testing) | Observations, measurements, CT scans, and experience provide a reliable basis; absence of lab replication goes to weight, not admissibility | Sig Sauer: failure to perform confirmatory testing and lack of literature make Villani’s theory unreliable | Reliable enough for admission; lack of testing goes to credibility and cross-examination |
| Whether Hicks is qualified and reliable to opine on defects and causation | Hicks is a mechanical engineer with testing/forensic experience on firearms and can explain mechanics and manufacturing issues | Sig Sauer: Hicks’s firearms testing experience is limited and he did not perform trigger-pull replication tests | Hicks is qualified (engineering background + firearms testing experience) and his methodology is sufficiently reliable for the jury to assess |
| Whether summary judgment is appropriate on causation/necessity of experts | Guay: experts show design/manufacturing defects and provide a basis to infer uncommanded discharge | Sig Sauer: experts aren’t certain the gun actually fired without trigger pull; without experts Guay cannot prove defect/causation | Summary judgment denied: admissible expert testimony and disputed facts create a triable issue for the jury; preponderance-of-evidence standard met to proceed |
Key Cases Cited
- Daubert v. Merrell Dow Pharms., Inc., 509 U.S. 579 (district court has gatekeeping role for expert testimony)
- Milward v. Acuity Specialty Prods. Grp., Inc., 639 F.3d 11 (distinguishes unreliable support from matters for jury weight)
- Ruiz-Troche v. Pepsi Cola of P.R. Bottling Co., 161 F.3d 77 (proponent need not prove expert's assessment correct at gatekeeping stage)
- Quilez-Velar v. Ox Bodies, Inc., 823 F.3d 712 (testing is not an absolute prerequisite to admit expert testimony)
- Martínez v. United States, 33 F.4th 20 (proponent bears burden to show admissibility)
- López-Ramírez v. Toledo-González, 32 F.4th 87 (focus on the process that generated the opinion)
- Carrozza v. CVS Pharm., Inc., 992 F.3d 44 (grounds for challenging expert testimony)
- Bogosian v. Mercedes-Benz of N. Am., 104 F.3d 472 (categories for challenging expert testimony)