An injector system for injection by puncture of an organ, of a non-deformable medical implant into a subject comprising: - a holding element having a proximal and distal end disposed with a chamber for containing the implant, - wherein the holding element is disposed with an exit port at the distal end for slidable ejection of the implant therethrough and into a bore of a needle component of an injection needle assembly, - a compliant member assembly having a through-passage, comprising at least two compliant members, the compliant member assembly having a biased state in which the at least two compliant members additively form a partial or total occlusion of the through-passage, wherein: - the compliant member assembly is configured in the biased state as a mechanical stop adapted to stop slidable entry of the implant into the bore under a force of gravity, - the through-passage is configured to receive slidably the implant under a force of injection in which the at least two compliant members deform and frictionally engage the implant, - the compliant members are arranged as segments (152a, b, c, d, n, m) within a circle or annular ring in the compliant member assembly, - the exit port is smaller than a transverse cross-sectional profile of the holding element chamber, - the compliant member assembly is configured to align the implant with the exit port and the bore of the needle component. - a holding element having a proximal and distal end disposed with a chamber for containing the implant, - wherein the holding element is disposed with an exit port at the distal end for slidable ejection of the implant therethrough and into a bore of a needle component of an injection needle assembly, - a compliant member assembly having a through-passage, comprising at least two compliant members, the compliant member assembly having a biased state in which the at least two compliant members additively form a partial or total occlusion of the through-passage, wherein: - the compliant member assembly is configured in the biased state as a mechanical stop adapted to stop slidable entry of the implant into the bore under a force of gravity, - the through-passage is configured to receive slidably the implant under a force of injection in which the at least two compliant members deform and frictionally engage the implant, - the compliant members are arranged as segments (152a, b, c, d, n, m) within a circle or annular ring in the compliant member assembly, - the exit port is smaller than a transverse cross-sectional profile of the holding element chamber, - the compliant member assembly is configured to align the implant with the exit port and the bore of the needle component. - the compliant member assembly is configured in the biased state as a mechanical stop adapted to stop slidable entry of the implant into the bore under a force of gravity, - the through-passage is configured to receive slidably the implant under a force of injection in which the at least two compliant members deform and frictionally engage the implant, - the compliant members are arranged as segments (152a, b, c, d, n, m) within a circle or annular ring in the compliant member assembly, - the exit port is smaller than a transverse cross-sectional profile of the holding element chamber, - the compliant member assembly is configured to align the implant with the exit port and the bore of the needle component.