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A sub caliber action device installable within an upper receiver of an AR-15 type firearm which interfaces with an upper receiver mounted forward assist for use with such as .22 caliber ammunition. The device includes a generally elongated receiver plate exhibiting a generally lengthwise extending n

A sub caliber action device installable within an upper receiver of an AR-15 type firearm which interfaces with an upper receiver mounted forward assist for use with such as .22 caliber ammunition. The device includes a generally elongated receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides, with the notched interior seating a bolt and a forward assist adaptor in reciprocating fashion along the receiver plate between an end-most location and a forward secured chamber adaptor. The adaptor is reconfigurable to inertially and linearly displace a limited distance relative to the bolt support sleeve during full auto firing mode and which influences the bolt against the chamber adaptor during striking of the bolt supported firing pin by the hammer.

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1. An action device installable within an upper receiver of an AR-15 type firearm which interfaces with a forward assist mounted in the upper receiver for use with a sub caliber ammunition, comprising: a receiver plate exhibiting a generally lengthwise extending notched interior established between

1. An action device installable within an upper receiver of an AR-15 type firearm which interfaces with a forward assist mounted in the upper receiver for use with a sub caliber ammunition, comprising: a receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides;said notched interior seating a bolt in a forward location and a forward assist adaptor in a rearward abutting location relative to said bolt during reciprocation along said receiver plate between an end-most location and a forward secured chamber adaptor; andsaid forward assist adaptor having a generally semi-circular cross sectional shape with a plurality of scales along an extending side in communication with a forward engaging pawl of the forward assist. 2. The invention as described in claim 1, said bolt further comprising a rearward projecting support sleeve including an open interior for receiving and seating an opposing guide rod associated with a further mounting location of said receiver plate and in order to maintain in assembled fashion said forward assist adaptor. 3. The invention as described in claim 2, further comprising said adaptor and bolt configured for both drop in (retrofit) and dedicated variations. 4. The invention as described in claim 1, said receiver plate further comprising a plurality of protrusions defined along said notched interior for seating said bolt and said forward assist adaptor. 5. The invention as described in claim 2, said adaptor further comprising a rear communicable slot seating an underside protuberance associated with said sleeve, said adaptor exhibiting a degree of linear travel relative to said sleeve in order to influence the bolt against the chamber adaptor during full auto firing mode. 6. The invention as described in claim 1, further comprising an auto-trip element secured to an underside location of said receiver plate. 7. The invention as described in claim 1, further comprising an end support secured to said receiver plate and exhibiting a side disposed notch for seating a rearward projecting side portion associated with said forward assist adaptor. 8. A sub-caliber action device installable within an upper receiver of an AR-15 type firearm which interfaces with an upper receiver mounted forward assist for use with at least .22 caliber ammunition, comprising: a generally elongated receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides, said notched interior seating a bolt in a forward reciprocating position and a forward assist adaptor in a rearward contacting and reciprocating fashion along said receiver plate between an end-most location and a forward secured chamber adaptor;an end support secured to said receiver plate and exhibiting a side disposed notch for seating a rearward projecting side portion associated with said forward assist adaptor;a rearward projecting support sleeve including an open interior for receiving and seating an opposing guide rod associated with a further mounting location of said receiver plate and in order to maintain in assembled fashion said forward assist adaptor; andsaid adaptor further comprising a rear communicable slot seating an underside protuberance associated with said sleeve, said adaptor exhibiting a degree of linear travel relative to said sleeve in order to influence the bolt against the chamber adaptor during full auto firing mode. 9. The invention as described in claim 8, said forward assist adaptor further comprising a generally semi-circular cross sectional shape with a plurality of scales along an extending side in communication with a forward engaging pawl of the forward assist. 10. The invention as described in claim 8, further comprising said adaptor and bolt configured for both drop in (retrofit) and dedicated variations. 11. The invention as described in claim 8, said receiver plate further comprising a plurality of protrusions defined along said notched interior for seating said bolt and said forward assist adaptor. 12. The invention as described in claim 8, further comprising an auto-trip element secured to an underside location of said receiver plate. 13. An action device installable within an upper receiver of an AR-15 type firearm which interfaces with a forward assist mounted in the upper receiver for use with a sub caliber ammunition, comprising: a receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides;said notched interior seating a bolt in a forward location and a forward assist adaptor in a rearward abutting location relative to said bolt during reciprocation along said receiver plate between an end-most location and a forward secured chamber adaptor; andan end support secured to said receiver plate and exhibiting a side disposed notch for seating a rearward projecting side portion associated with said forward assist adaptor. 14. A sub-caliber action device installable within an upper receiver of an AR-15 type firearm which interfaces with an upper receiver mounted forward assist for use with at least .22 caliber ammunition, comprising: a generally elongated receiver plate exhibiting a generally lengthwise extending notched interior established between extending sides, said notched interior seating a bolt in a forward reciprocating position and a forward assist adaptor in a rearward contacting and reciprocating fashion along said receiver plate between an end-most location and a forward secured chamber adaptor, said adaptor having a generally semi-circular cross sectional shape with a plurality of scales along an extending side in communication with a forward engaging pawl of the forward assist;a rearward projecting support sleeve including an open interior for receiving and seating an opposing guide rod associated with a further mounting location of said receiver plate and in order to maintain in assembled fashion said forward assist adaptor; andsaid adaptor further comprising a rear communicable slot seating an underside protuberance associated with said sleeve, said adaptor exhibiting a degree of linear travel relative to said sleeve in order to influence the bolt against the chamber adaptor during full auto firing mode.