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COMPATIBLE
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FAVORITES
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COMPATIBLE W/ NOTE
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NOT COMPATIBLE
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Compatibility List for FRS-Standard (Single), Ambi, Mil-Spec (Single)
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BRANDTRIGGER MODELSCOMPATIBLENOTESURL
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Aero PrecisionAero Precision FCG KItYESM4E1 (& milspec) (these may be the same)https://www.aeroprecisionusa.com/fire-control-group-fcg-kit
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Aim SurplusSSTAT Single Stage AR TriggerYESCustomer Reported No Issues
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ALGALG Defense CombatYES*Can work, but multiple users report having to polish trigger bar/cam lever for consistent reliabilityDiscontinued
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ALGALG ACT TriggerYESALG line is separate from GEISSELE linehttps://geissele.com/alg-combat-trigger-act.html
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Anderson MFCAnderson MFCYESDiscontinuedDiscontinued
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ArmaliteArmaliteYES
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AT3AT3 GI Mil SpecYEShttps://www.at3tactical.com/products/at3-gi-trigger-assembly-mil-spec-ar-15-fire-control-group
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BCMBCM PNTYES*BCM PNT has been updated with new finish and potentially new geometryhttps://bravocompanyusa.com/bcm-pnt-trigger-assembly-ar15/
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Blackout DefenseBlackout Defense Hybrid 3lbs SSYESCustomer Reported No Issueshttps://blackoutdefense.com/product/ar-15-zero-trigger-curved-single/
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CMCCMC 90503NOTrigger Bar incompatible, Safety Issues
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CMMGZeroed TriggerYESCustomer Reported no issues
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Dirty Bird Dirty Bird Single Stage (Nickel Teflon)YESPSR's Default Favoritehttps://dirtybirdusa.com/products/dirty-bird-industries-single-stage-nickel-teflon-trigger-group/
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ElftmannELFTMANN SEYESCustomer Reported No Issueshttps://www.elftactical.com/LEGACY-MATCH-PRO-SE-TRIGGER-NO-KNOB_p_91.html
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FNFN FactoryYES
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GeisseleSSA, SSA-E, G2SYES*MUST BUY G LEVER FRS*
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GeisseleSSA-X, SSA-E-X, SD3G, SDE, SDCNOTrigger Bars too thick or too tall
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GMRGMR SS CutYES
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Heckler KochHK MR556A1 TriggerNOIncompatible Trigger bar
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HyperfireHyperfire EDTYESCustomer Reported No Issues, Have not tested internally
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Jacob GrayJacob Gray Single StageYEShttps://jacobgreyfirearms.com/shop/jgtrig35ss-jg-signature-3-5-lb-single-stage-drop-in-trigger-flat-face-includes-anti-walk-pins-1720#attr=
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LarueMBTNOTrigger bar is too thick, Safety issues
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MimTacMimTac DrasticYESMust use a lever blocker since hammer is shorter than mil-spec. https://mimtac.com/drastic-ar15-drop-in-trigger/
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MimTacMimTac ValkyrieYES
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Noveske Noveske Single StageYEShttps://noveske.com/products/noveske-single-stage-trigger/
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PSA PSA EPTYES*PSA EPT has two potential designs, ensure you grab the one with no U notch cut in the trigger barhttps://palmettostatearmory.com/psa-ar15-pa10-enhanced-polished-trigger.html
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PSA PSA Custom SS Drop InYES*Some customers report safety issueshttps://palmettostatearmory.com/psa-custom-ar-3-5-lbs-match-grade-drop-in-trigger-flat-116055.html
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QQ ACC-TRIGGER-LITERALLYNOTrigger Bar incompatible, Safety Issues
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Rise ArmamentRave 140YESATRIUS FAVORITE, RISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product-category/triggers/
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Rise ArmamentRA-240 Gen 1 and Gen 2 (Includes RA-240 HEXC)YESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product/rise-armament-ra-240-trigger/
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Rise ArmamentRA-242 Gen 1 and Gen 2YESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product/rise-armament-ra-242-trigger/
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Rise ArmamentRA 434YESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product-category/triggers/
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Rise ArmamentRA 535YESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product-category/triggers/
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Rise ArmamentRA BlitzYESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product-category/triggers/
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Rise ArmamentRA LE145YESRISE Armament Single Stage Triggers are Drop In Readyhttps://risearmament.com/product-category/triggers/
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Rise ArmamentICONICNO2 stage drop in is not compatiblehttps://risearmament.com/product-category/triggers/
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Rock River ArmsTwo Stage Match Varmit TriggerYESReported by customer to work
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Schmid InsideSchmid Two-StageNO
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Schmid InsideSchmid AR Pro Line TriggerYESATRIUS FAVORITE, most reliable and consistent in-spec performance. No frills no thrills
https://www.midwayusa.com/product/1025028297?srsltid=AfmBOopYJZMpufJSmUJAzSl8o631siKaWWOzgbeRWUwFYP3D8UK5Cw_h&pid=460889
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Schmid InsideSchmid Inside GI Flat Face SSYESWas tested with Elite Spring Kit
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Schmid InsideSchmid Inside Match Flat Face SSYESWas tested with Elite Spring Kit
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Smith DefenseAR15 Lower Parts KitYESSquared off trigger bar in the rear but does have a slight dip
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Sons of Liberty Gun WorksSOLGW LFTYEShttps://sonsoflibertygw.com/product/liberty-fighting-trigger/
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Spikes TacticalSpikes ST BattleYEShttps://www.spikestactical.com/collections/triggers/st-battle-trigger/
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TimneyTimney Competition 3LBYEShttps://timneytriggers.com/ar-15-competition-trigger/
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TimneyCalvin EliteYEShttps://timneytriggers.com/ar-calvin-elite-single-stage-drop-in/
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TimneyImpact Drop InYES
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Trigger TechALL MODELSNONOT COMPATIBLE
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Heckler KochHK MR556A1 TriggerNOIncompatible Trigger Bar
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Velocity3.5lb triggerYESCustomer Reported No Issues
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*Note, this chart does not take into account any generational changes or batch changes implemented by the manufacterer. Updates or changes to the part could effect compatibility.
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Compatibility List for FRS G-LEVER
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BRANDTRIGGER MODELSCOMPATIBLENOTESURL
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GeisseleSSA, SSA-E, G2SYeshttps://geissele.com/super-semi-automatic-ssar-trigger.html , https://geissele.com/super-semi-automatic-enhanced-ssa-e-trigger.html , https://geissele.com/geissele-2-stage-g2s-trigger.html
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GeisseleSSA-X, SSA-E-X, SD3G, SDE, SDCNo
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Schmid 2 Stage Trigger YesThe reduced hammer design is similar to that of the Geisseles which is why we've found it to be compatiblehttps://www.trex-arms.com/store/schmid-two-stage-trigger-1268363?srsltid=AfmBOoonQCQ_WxKHzSU2wByoSq4iQJ5T-FbmHJ9wVumCh_4t4cM5pBjv
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